function keyDown(e) {
		var evtobj=window.event? event : e //distinguish between IE and Firefox
		var unicode=evtobj.charCode? evtobj.charCode : evtobj.keyCode
		//var actualkey=String.fromCharCode(unicode)
		if(unicode==113){
	        location.href=cambiaMod;			
		}
	}
	
document.onkeydown = keyDown