// JavaScript Document

var navegador = navigator.appName
// Sobreescrivim la funcio alert nomes si no estem amb IE
if (navegador != "Microsoft Internet Explorer") {
	// constants to define the title of the alert and button text.
	var ALERT_TITLE = " "/*"Oops!"*/;
	var ALERT_BUTTON_TEXT = "Ok";
	
	// over-ride the alert method only if this a newer browser.
	// Older browser will see standard alerts
	if(document.getElementById) {
		window.alert = function(txt) {
			createCustomAlert(txt);
		}
	}
	
	function createCustomAlert(txt) {
		// shortcut reference to the document object
		d = document;
	
		// if the modalContainer object already exists in the DOM, bail out.
		if(d.getElementById("modalContainer")) return;
	
		// create the modalContainer div as a child of the BODY element
		mObj = d.getElementsByTagName("body")[0].appendChild(d.createElement("div"));
		mObj.id = "modalContainer";
		 // make sure its as tall as it needs to be to overlay all the content on the page
		mObj.style.height = document.documentElement.scrollHeight + "px";
	
		// create the DIV that will be the alert 
		alertObj = mObj.appendChild(d.createElement("div"));
		alertObj.id = "alertBox";
		// MSIE doesnt treat position:fixed correctly, so this compensates for positioning the alert
		if(d.all && !window.opera) alertObj.style.top = document.documentElement.scrollTop + "px";
		// center the alert box
		alertObj.style.left = (d.documentElement.scrollWidth - alertObj.offsetWidth)/2 + "px";
	
		// create an H1 element as the title bar
		h1 = alertObj.appendChild(d.createElement("h1"));
		h1.appendChild(d.createTextNode(ALERT_TITLE));
	
		// create a paragraph element to contain the txt argument
		msg = alertObj.appendChild(d.createElement("p"));
		msg.appendChild(d.createTextNode(txt));
	
		// create an anchor element to use as the confirmation button.
		btn = alertObj.appendChild(d.createElement("a"));
		btn.id = "closeBtn";
		btn.appendChild(d.createTextNode(ALERT_BUTTON_TEXT));
		btn.href = "#";
		// set up the onclick event to remove the alert when the anchor is clicked
		btn.onclick = function() { removeCustomAlert();return false; }
	
		
	}
	
	// removes the custom alert from the DOM
	function removeCustomAlert() {
		document.getElementsByTagName("body")[0].removeChild(document.getElementById("modalContainer"));
	}
}