ok I know it sound stronge but let me explaine

I have a script that disable fields based on a checkbox been cheked or not
it also hide a select field if it is checked . what I need is to echo a hidden field in my form

let me show you

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<script>
 
function updateBox(){
	if(document.forms[0].SUPPORT.checked){
		document.forms[0].ids.style.visibility = "hidden";
		document.write("<input type='hidden' name='ids' value='2'>");
	}else{
		document.forms[0].ids.style.visibility = "visible";
	} 
}
</script>
but this does not work

could you please help me or guide me to a place I can find an answer

thank you