// Funcion PopUp Ventana
function popup(url,ancho,alto,id,extras){
    var left = (screen.availWidth-ancho)/2; 
    var top = (screen.availHeight-alto)/2; 
    if(extras!=""){extras=","+extras;};	 
	if(screen.availWidth>ancho){
		eval("window.open('"+url+"','"+id+"','width="+ancho+",height="+alto+",left="+left+",top="+top+",screenX="+left+",screenY="+top+extras+", toolbar=no, menubar=no, scrollbars=no, resizable=no, status=no, location=no')");
	}else{
		eval("window.open('"+url+"','"+id+"','width="+screen.availWidth+",height="+screen.availHeight+",left="+left+",top="+top+",screenX="+left+",screenY="+top+extras+", toolbar=no, menubar=no, scrollbars=yes, resizable=no, status=no, location=no')");
	};
}