var dom = document.getElementById ? true:false;
var ns4 = document.layers ? true:false;
var ie4 = document.all ? true:false;
var mac = navigator.appVersion.indexOf('Mac')!=-1 ? true:false;

function preload(imgObj,imgSrc) {
	eval(imgObj+" = new Image()");
	eval(imgObj+".src = '"+imgSrc+"'");
}

function changeImg(imgObj,imgSrc) {
	if (navigator.appVersion >= "3") {
		var imatge = eval(imgSrc+".src");
		document.images[imgObj].src = imatge;
	}
}

function blurLinks() {
	if (dom) {
		lnks = document.getElementsByTagName('a');
		for (i=0;i<lnks.length;i++) {
			lnks[i].onfocus = new Function("if(this.blur) this.blur()");
		}
	} else if (ie4) {
		for (var i in document.links) {
			document.links[i].onfocus = document.links[i].blur;
		}
	}
}

function showPic(pic) {
	document.getElementById("visor").innerHTML = '<table style="width: 600px; height: 335px;"><tr><td style="text-align: center; vertical-align: middle;"><img src="'+pic+'" alt="" /></td></tr></table>';
}

function saveCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	} else {
		expires = "";
	}
	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
	var nameEQ = name+"=";
	var ca = document.cookie.split(';');
	for(var i=0;i<ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function deleteCookie(name) {
	saveCookie(name,"",-1);
}