ns4 = (document.layers)? true:false;
ie4 = (document.all)? true:false;
sp4 = (document.getElementsByTagName)? true:false;


function hide(id) {
        if (ns4) document.layers[id].visibility = "hide"
        else if (ie4) document.all[id].style.visibility = "hidden"
        else if (sp4) document.getElementsByTagName("div")[id].style.visibility = "hidden"
}

function show(id) {
        if (ns4) document.layers[id].visibility = "show"
        else if (ie4) document.all[id].style.visibility = "visible"
        else if (sp4) document.getElementsByTagName("div")[id].style.visibility = "visible"
}

function preCarga() {
if (!document.images) return;
var ar = new Array();
var arguments = preCarga.arguments;
for (var i = 0; i < arguments.length; i++) {
ar[i] = new Image();
ar[i].src = arguments[i];
}
}

function foto_gran(nom){
		window.open(nom + location.search,'wnova3','scrollbars=1,status=0,toolbar=0,resizable=1,width=770,height=520')
	}