// JavaScript Document
function writediv(id,texte)
{
	document.getElementById(id).innerHTML = texte;
}
function deletediv(id)
{
	document.getElementById(id).innerHTML = "";
}

function active_cat(id_cat)
{
	var rep = file("../menus/menu_subitems.php?id_cat="+escape(id_cat));
	id_div = "mainmenuitem"+id_cat;
	writediv(id_div,rep);
}
function presentation_div()
{
	document.getElementById("maininfoprod-contenu").style.display="";
	document.getElementById("maininfoprod-fichetech").style.display="none";
	document.getElementById("maininfoprod-titrepres").style.color="#137964";
	document.getElementById("maininfoprod-titrefiche").style.color="#999999";
}
function fiche_div()
{
	document.getElementById("maininfoprod-contenu").style.display="none";
	document.getElementById("maininfoprod-fichetech").style.display="";
	document.getElementById("maininfoprod-titrepres").style.color="#999999";
	document.getElementById("maininfoprod-titrefiche").style.color="#137964";
}

function replace_img()
{
	var rep = document.getElementById("maininfoprod-petite1").innerHTML;
	
	rep = rep.replace (/_s.jpg/g,"_m.jpg");
	rep = rep.replace (/height="52px"/g,'height="240px"');
	rep = rep.replace (/width="60px"/g,'width="300px"');
	rep = rep.replace (/height="52px"/g,'height="240px"');
	rep = rep.replace (/width="60px"/g,'width="300px"');
	rep = rep.replace ('onmouseover="replace_img()"',' ');
	rep = rep.replace ('onmouseover="replace_img()"',' ');
	writediv("maininfoprod-moyenne",rep);
}

function replace_img1()
{
	var rep = document.getElementById("maininfoprod-petite2").innerHTML;
	rep = rep.replace (/_s.jpg/g,"_m.jpg");
	rep = rep.replace (/height="52px"/g,'height="240px"');
	rep = rep.replace (/width="60px"/g,'width="300px"');
	rep = rep.replace (/height="52px"/g,'height="240px"');
	rep = rep.replace (/width="60px"/g,'width="300px"');
	rep = rep.replace ('onmouseover="replace_img1()"',' ');
	rep = rep.replace ('onmouseover="replace_img1()"',' ');
	writediv("maininfoprod-moyenne",rep);
}

function replace_img2()
{
	var rep = document.getElementById("maininfoprod-petite3").innerHTML;
	//alert(rep);
	rep = rep.replace (/_s.jpg/g,'_m.jpg');
	rep = rep.replace (/height="52px"/g,'height="240px"');
	rep = rep.replace (/width="60px"/g,'width="300px"');
	rep = rep.replace (/height="52px"/g,'height="240px"');
	rep = rep.replace (/width="60px"/g,'width="300px"');
	rep = rep.replace ('onmouseover="replace_img2()"',' ');
	rep = rep.replace ('onmouseover="replace_img2()"',' ');
	//alert(rep);
	writediv("maininfoprod-moyenne",rep);
}

<!-- Fonction file()
function file(fichier)
{
	if(window.XMLHttpRequest) // FIREFOX
		xhr_object = new XMLHttpRequest();
	else if(window.ActiveXObject) // IE
		xhr_object = new ActiveXObject("Microsoft.XMLHTTP");
	else
		return(false);
	xhr_object.open("GET", fichier, false);
	xhr_object.send(null);
	if(xhr_object.readyState == 4) return(xhr_object.responseText);
	else return(false);
}