sfHover = function() {
	var sfEls = document.getElementById("nav").getElementsByTagName("li");
	for (var i=0; i<sfEls.length; i++) {
		sfEls[i].onmouseover=function() {
			this.className+=" sfhover";
		}
		sfEls[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
		}
	}
}
if (window.attachEvent) window.attachEvent("onload", sfHover);


		function setOpacity(id, opacity) {
		  obj = document.getElementById(id);		  		  		 
		  // IE/Win
		  obj.style.filter = "alpha(opacity="+(opacity*10)+")";		  
		  // Safari<1.2, Konqueror
		  obj.style.KHTMLOpacity = opacity/101;		  
		  // Older Mozilla and Firefox
		  obj.style.MozOpacity = opacity/101;		  
		  // Safari 1.2, newer Firefox and Mozilla, CSS3
		  obj.style.opacity = opacity/101;		  
		}	
		
						
		function fadeIn(id,opacity,time) {		  			
			obj = document.getElementById(id);
			if (opacity <= 100) {
			  setOpacity(id, opacity);
			  opacity += 10;
			  window.setTimeout("fadeIn('"+ id +"'," + opacity + "," + time + ")", time);
			}
		}

		function fadein_error(id){			
			setOpacity(id,0);
			document.getElementById(id).style.visibility = 'visible';	
			fadeIn(id,0,20);
		}
		
		function confirm_delete(url){
			if(confirm('żEsta seguro que desea eliminar el elemento seleccionado?')){
				document.location = url;
			}
		}
		
		//disable right button
		document.oncontextmenu = function(){return false}