var btn1 = new Image(); 
	var btn2 = new Image(); 
	var btn3 = new Image();
	var btn4 = new Image();
	var btn5 = new Image();
	var btn6 = new Image(); 
	
	function load_menu(prefix) {
		
		/*			HEADER MENU			*/
		btn1.src = "/images/header/buttons/btn_home_b.gif";
		btn1.src_ori = "/images/header/buttons/btn_home.gif";
		
		btn2.src =  "/images/header/buttons/btn_contact_b.gif";
		btn2.src_ori =  "/images/header/buttons/btn_contact.gif";
		
		btn3.src =  "/images/header/buttons/btn_events_b.gif";
		btn3.src_ori =  "/images/header/buttons/btn_events.gif";
		
		btn4.src = "/images/header/buttons/btn_apply_online_b.gif";
		btn4.src_ori = "/images/header/buttons/btn_apply_online.gif";
		
		btn5.src = "/images/header/buttons/btn_chat_b.gif";
		btn5.src_ori = "/images/header/buttons/btn_chat.gif";

		btn6.src = "/images/header/buttons/btn_alumni_b.gif";
		btn6.src_ori = "/images/header/buttons/btn_alumni.gif";
	
	}
	
	function rollover_(button_no){		
		obj_roll = eval("document.getElementById('btn" + button_no + "')");
		btn_roll = eval ("btn" + button_no);
		
		if(btn_roll.src == null || btn_roll.src == '') return;
		
		obj_roll.src = btn_roll.src;		
	}
	
	function rollout_(button_no){
		obj_roll = eval("document.getElementById('btn" + button_no + "')");
		btn_roll = eval ("btn" + button_no);
		
		if(btn_roll.src_ori == null || btn_roll.src_ori == '') return;
		
		obj_roll.src = btn_roll.src_ori;
	}	
	
	function windowPop(theURL,winName,features) { //v2.0
window.open(theURL,winName,features);
    }
	
	/* POP UP */
	
	var popWindow = null;
	
	function popup(archivo,width,height) {
			var hor
			var ver
			var ubix
			var ubiy
			ubix=width/2
			ubiy=height/2
			hor= screen.width/2-ubix;
			ver= screen.height/2-ubiy;
			
			if(popWindow != null)
				popWindow.close();
			
			popWindow = window.open(archivo,"", "left="+hor+",top="+ver+",toolbar=0,location=0,directories=0,status=0,menubar=no,scrollbars=no,resizable=no,width="+width+",height="+height);
	}
	
	
	var popWindow = null;
	
	function popup2(archivo,width,height) {
			var hor
			var ver
			var ubix
			var ubiy
			ubix=width/2
			ubiy=height/2
			hor= screen.width/2-ubix;
			ver= screen.height/2-ubiy;
			
			if(popWindow != null)
				popWindow.close();
			
			popWindow = window.open(archivo,"", "left="+hor+",top="+ver+",toolbar=0,location=0,directories=0,status=0,menubar=no,scrollbars=yes,resizable=no,width="+width+",height="+height);
	}