function roll(name,source)
{
	if (document.images) 
	{
		//alert ('document.images["'+name+'"].src = "'+source+'" ;')
		eval("document.images."+name+".src = '"+source+"' ;");
		//document.images[name].src = source ;
		//x = eval('document.images.'+name+'.src ;')
		//alert (x)

	}
}

function montre(id) {
	  if (document.getElementById) {
		  document.getElementById(id).style.visibility="visible";
		} else if (document.all) {
		  document.all[id].style.visibility="visible";
		} else if (document.layers) {
		  document.layers[id].visibility="visible";
		} }
		
function cache(id) {
	  if (document.getElementById) {
		  document.getElementById(id).style.visibility="hidden";
		} else if (document.all) {
		  document.all[id].style.visibility="hidden";
		} else if (document.layers) {
		  document.layers[id].visibility="hidden";
		} }