Du JavaScript dans la balise <body>

Salut à tous ;)
Je viens de me retrouver face à une balise <body> ultra chargée correspondante à l'un des sites que je suis entrain d'analyser pour mieux le comprendre, la voilà:
Code:
<body link="1c61ac" vlink="1c61ac" alink="1c61ac" onLoad="MM_timelinePlay('Timeline1')">
Ce que je ne comprends pas c'est le
Code:
onLoad="MM_timelinePlay('Timeline1')"
Je porte à votre connaissance qu'il y a deux cents lignes de JavaScript avant la balise <body>, supposée (à mon humble avis) etre responsable des mouvements d'images sur la page. Voici le code JavaScript se trouvant avant la balise <body>
Code:
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function MM_reloadPage(init) {  //reloads the window if Nav4 resized
 
  if (init==true) with (navigator) {if ((appName=="Netscape")&&(parseInt(appVersion)==4)) {
 
    document.MM_pgW=innerWidth; document.MM_pgH=innerHeight; onresize=MM_reloadPage; }}
 
  else if (innerWidth!=document.MM_pgW || innerHeight!=document.MM_pgH) location.reload();
 
}
 
MM_reloadPage(true);
 
 
 
function MM_timelinePlay(tmLnName, myID) { //v1.2
 
  //Copyright 1997, 2000 Macromedia, Inc. All rights reserved.
 
  var i,j,tmLn,props,keyFrm,sprite,numKeyFr,firstKeyFr,propNum,theObj,firstTime=false;
 
  if (document.MM_Time == null) MM_initTimelines(); //if *very* 1st time
 
  tmLn = document.MM_Time[tmLnName];
 
  if (myID == null) { myID = ++tmLn.ID; firstTime=true;}//if new call, incr ID
 
  if (myID == tmLn.ID) { //if Im newest
 
    setTimeout('MM_timelinePlay("'+tmLnName+'",'+myID+')',tmLn.delay);
 
    fNew = ++tmLn.curFrame;
 
    for (i=0; i<tmLn.length; i++) {
 
      sprite = tmLn[i];
 
      if (sprite.charAt(0) == 's') {
 
        if (sprite.obj) {
 
          numKeyFr = sprite.keyFrames.length; firstKeyFr = sprite.keyFrames[0];
 
          if (fNew >= firstKeyFr && fNew <= sprite.keyFrames[numKeyFr-1]) {//in range
 
            keyFrm=1;
 
            for (j=0; j<sprite.values.length; j++) {
 
              props = sprite.values[j]; 
 
              if (numKeyFr != props.length) {
 
                if (props.prop2 == null) sprite.obj[props.prop] = props[fNew-firstKeyFr];
 
                else        sprite.obj[props.prop2][props.prop] = props[fNew-firstKeyFr];
 
              } else {
 
                while (keyFrm<numKeyFr && fNew>=sprite.keyFrames[keyFrm]) keyFrm++;
 
                if (firstTime || fNew==sprite.keyFrames[keyFrm-1]) {
 
                  if (props.prop2 == null) sprite.obj[props.prop] = props[keyFrm-1];
 
                  else        sprite.obj[props.prop2][props.prop] = props[keyFrm-1];
 
        } } } } }
 
      } else if (sprite.charAt(0)=='b' && fNew == sprite.frame) eval(sprite.value);
 
      if (fNew > tmLn.lastFrame) tmLn.ID = 0;
 
  } }
 
}
 
 
 
function MM_initTimelines() { //v4.0
 
    //MM_initTimelines() Copyright 1997 Macromedia, Inc. All rights reserved.
 
    var ns = navigator.appName == "Netscape";
 
    var ns4 = (ns && parseInt(navigator.appVersion) == 4);
 
    var ns5 = (ns && parseInt(navigator.appVersion) > 4);
 
    document.MM_Time = new Array(1);
 
    document.MM_Time[0] = new Array(5);
 
    document.MM_Time["Timeline1"] = document.MM_Time[0];
 
    document.MM_Time[0].MM_Name = "Timeline1";
 
    document.MM_Time[0].fps = 15;
 
    document.MM_Time[0][0] = new String("sprite");
 
    document.MM_Time[0][0].slot = 1;
 
    if (ns4)
 
        document.MM_Time[0][0].obj = document["Layer5"];
 
    else if (ns5)
 
        document.MM_Time[0][0].obj = document.getElementById("Layer5");
 
    else
 
        document.MM_Time[0][0].obj = document.all ? document.all["Layer5"] : null;
 
    document.MM_Time[0][0].keyFrames = new Array(10, 25);
 
    document.MM_Time[0][0].values = new Array(3);
 
    if (ns5)
 
        document.MM_Time[0][0].values[0] = new Array("220px", "220px", "220px", "220px", "220px", "220px", "220px", "220px", "220px", "220px", "220px", "220px", "220px", "220px", "220px", "220px");
 
    else
 
        document.MM_Time[0][0].values[0] = new Array(220,220,220,220,220,220,220,220,220,220,220,220,220,220,220,220);
 
    document.MM_Time[0][0].values[0].prop = "left";
 
    if (ns5)
 
        document.MM_Time[0][0].values[1] = new Array("20px", "33px", "47px", "60px", "73px", "87px", "100px", "113px", "127px", "140px", "153px", "167px", "180px", "193px", "207px", "220px");
 
    else
 
        document.MM_Time[0][0].values[1] = new Array(20,33,47,60,73,87,100,113,127,140,153,167,180,193,207,220);
 
    document.MM_Time[0][0].values[1].prop = "top";
 
    if (!ns4) {
 
        document.MM_Time[0][0].values[0].prop2 = "style";
 
        document.MM_Time[0][0].values[1].prop2 = "style";
 
    }
 
    document.MM_Time[0][0].values[2] = new Array("2","1");
 
    document.MM_Time[0][0].values[2].prop = "zIndex";
 
    if (!ns4)
 
        document.MM_Time[0][0].values[2].prop2 = "style";
 
    document.MM_Time[0][1] = new String("sprite");
 
    document.MM_Time[0][1].slot = 2;
 
    if (ns4)
 
        document.MM_Time[0][1].obj = document["Layer6"];
 
    else if (ns5)
 
        document.MM_Time[0][1].obj = document.getElementById("Layer6");
 
    else
 
        document.MM_Time[0][1].obj = document.all ? document.all["Layer6"] : null;
 
    document.MM_Time[0][1].keyFrames = new Array(20, 35);
 
    document.MM_Time[0][1].values = new Array(2);
 
    if (ns5)
 
        document.MM_Time[0][1].values[0] = new Array("370px", "370px", "370px", "370px", "370px", "370px", "370px", "370px", "370px", "370px", "370px", "370px", "370px", "370px", "370px", "370px");
 
    else
 
        document.MM_Time[0][1].values[0] = new Array(370,370,370,370,370,370,370,370,370,370,370,370,370,370,370,370);
 
    document.MM_Time[0][1].values[0].prop = "left";
 
    if (ns5)
 
        document.MM_Time[0][1].values[1] = new Array("20px", "33px", "47px", "60px", "73px", "87px", "100px", "113px", "127px", "140px", "153px", "167px", "180px", "193px", "207px", "220px");
 
    else
 
        document.MM_Time[0][1].values[1] = new Array(20,33,47,60,73,87,100,113,127,140,153,167,180,193,207,220);
 
    document.MM_Time[0][1].values[1].prop = "top";
 
    if (!ns4) {
 
        document.MM_Time[0][1].values[0].prop2 = "style";
 
        document.MM_Time[0][1].values[1].prop2 = "style";
 
    }
 
    document.MM_Time[0][2] = new String("sprite");
 
    document.MM_Time[0][2].slot = 3;
 
    if (ns4)
 
        document.MM_Time[0][2].obj = document["Layer7"];
 
    else if (ns5)
 
        document.MM_Time[0][2].obj = document.getElementById("Layer7");
 
    else
 
        document.MM_Time[0][2].obj = document.all ? document.all["Layer7"] : null;
 
    document.MM_Time[0][2].keyFrames = new Array(30, 45);
 
    document.MM_Time[0][2].values = new Array(2);
 
    if (ns5)
 
        document.MM_Time[0][2].values[0] = new Array("520px", "520px", "520px", "520px", "520px", "520px", "520px", "520px", "520px", "520px", "520px", "520px", "520px", "520px", "520px", "520px");
 
    else
 
        document.MM_Time[0][2].values[0] = new Array(520,520,520,520,520,520,520,520,520,520,520,520,520,520,520,520);
 
    document.MM_Time[0][2].values[0].prop = "left";
 
    if (ns5)
 
        document.MM_Time[0][2].values[1] = new Array("20px", "33px", "47px", "60px", "73px", "87px", "100px", "113px", "127px", "140px", "153px", "167px", "180px", "193px", "207px", "220px");
 
    else
 
        document.MM_Time[0][2].values[1] = new Array(20,33,47,60,73,87,100,113,127,140,153,167,180,193,207,220);
 
    document.MM_Time[0][2].values[1].prop = "top";
 
    if (!ns4) {
 
        document.MM_Time[0][2].values[0].prop2 = "style";
 
        document.MM_Time[0][2].values[1].prop2 = "style";
 
    }
 
    document.MM_Time[0][3] = new String("sprite");
 
    document.MM_Time[0][3].slot = 4;
 
    if (ns4)
 
        document.MM_Time[0][3].obj = document["Layer8"];
 
    else if (ns5)
 
        document.MM_Time[0][3].obj = document.getElementById("Layer8");
 
    else
 
        document.MM_Time[0][3].obj = document.all ? document.all["Layer8"] : null;
 
    document.MM_Time[0][3].keyFrames = new Array(40, 55);
 
    document.MM_Time[0][3].values = new Array(2);
 
    if (ns5)
 
        document.MM_Time[0][3].values[0] = new Array("670px", "670px", "670px", "670px", "670px", "670px", "670px", "670px", "670px", "670px", "670px", "670px", "670px", "670px", "670px", "670px");
 
    else
 
        document.MM_Time[0][3].values[0] = new Array(670,670,670,670,670,670,670,670,670,670,670,670,670,670,670,670);
 
    document.MM_Time[0][3].values[0].prop = "left";
 
    if (ns5)
 
        document.MM_Time[0][3].values[1] = new Array("20px", "33px", "47px", "60px", "73px", "87px", "100px", "113px", "127px", "140px", "153px", "167px", "180px", "193px", "207px", "220px");
 
    else
 
        document.MM_Time[0][3].values[1] = new Array(20,33,47,60,73,87,100,113,127,140,153,167,180,193,207,220);
 
    document.MM_Time[0][3].values[1].prop = "top";
 
    if (!ns4) {
 
        document.MM_Time[0][3].values[0].prop2 = "style";
 
        document.MM_Time[0][3].values[1].prop2 = "style";
 
    }
 
    document.MM_Time[0][4] = new String("sprite");
 
    document.MM_Time[0][4].slot = 5;
 
    if (ns4)
 
        document.MM_Time[0][4].obj = document["Layer9"];
 
    else if (ns5)
 
        document.MM_Time[0][4].obj = document.getElementById("Layer9");
 
    else
 
        document.MM_Time[0][4].obj = document.all ? document.all["Layer9"] : null;
 
    document.MM_Time[0][4].keyFrames = new Array(50, 64);
 
    document.MM_Time[0][4].values = new Array(2);
 
    if (ns5)
 
        document.MM_Time[0][4].values[0] = new Array("835px", "835px", "835px", "835px", "835px", "835px", "835px", "835px", "835px", "835px", "835px", "835px", "835px", "835px", "835px");
 
    else
 
        document.MM_Time[0][4].values[0] = new Array(835,835,835,835,835,835,835,835,835,835,835,835,835,835,835);
 
    document.MM_Time[0][4].values[0].prop = "left";
 
    if (ns5)
 
        document.MM_Time[0][4].values[1] = new Array("20px", "34px", "49px", "63px", "77px", "91px", "106px", "120px", "134px", "149px", "163px", "177px", "191px", "206px", "220px");
 
    else
 
        document.MM_Time[0][4].values[1] = new Array(20,34,49,63,77,91,106,120,134,149,163,177,191,206,220);
 
    document.MM_Time[0][4].values[1].prop = "top";
 
    if (!ns4) {
 
        document.MM_Time[0][4].values[0].prop2 = "style";
 
        document.MM_Time[0][4].values[1].prop2 = "style";
 
    }
 
    document.MM_Time[0].lastFrame = 64;
 
    for (i=0; i<document.MM_Time.length; i++) {
 
        document.MM_Time[i].ID = null;
 
        document.MM_Time[i].curFrame = 0;
 
        document.MM_Time[i].delay = 1000/document.MM_Time[i].fps;
 
    }
 
}
Et pour etre plus clair, voilà le Site
Merci de me donner votre avis sur l'utilité et le fonctionnement d'un tel traitement ;)

PS:
Je crois qu'il y a trop de redondances dans ce code JavaScript suite à un usage abusif d'environnement "WYSIWYG" par les concepteurs du site, Qu'est ce que vous en pensez ?