function cambProp(obj, propIE, propNS, valorIE, valorNS)
{
if (document.all)
{
	obj = document.all[obj];
	obj.style[propIE] = valorIE;
}
else
	if (obj=document.getDocumentById) obj.style[propIE] = valorIE;
	else
	{
		obj = document.layers[obj];
		obj[propNS] = valorNS;
	}
}