// Cambio de estilo de un elemento
function mySwapStyle(id_elemento, estilo){
	document.getElementById(id_elemento).className = estilo;
}

function OpenWindow(URL, ancho, alto) {
   var availHeight = screen.availHeight;
   var availWidth = screen.availWidth;
   var x = 0, y = 0; 
   if (document.all) {
        x = window.screenTop; 
        y = window.screenLeft;
   }
   else if (document.layers) {  
        x = window.screenX;
        y = window.screenY;
   }
 
   availWidth = (availWidth - ancho)/2; 
   availHeight = (availHeight - alto)/2;

   var arguments = 'resizable=no,maximize=no,toolbar=0,location=0,directories=0,addressbar=0,scrollbars=no,status=0,menubar=0,top=0,left=0,top='+availHeight+',left='+availWidth+',width='+ancho+',height='+alto;
   var newWindow = window.open(URL,'newWindow',arguments);
}

var timer_id;
function scroll_iframe(frm,inc,dir) {
  if (timer_id) clearTimeout(timer_id);
  if (window.frames[frm]) {
    if (dir == "v") window.frames[frm].scrollBy(0, inc);
    else window.frames[frm].scrollBy(inc, 0);
    timer_id = setTimeout("scroll_iframe('" + frm + "'," + inc + ",'" + dir + "')", 20);
  }
}

function stopScroll() { if (timer_id) clearTimeout(timer_id); }