// JavaScript Document
function f_scrollTop() {
	return f_filterResults (
		window.pageYOffset ? window.pageYOffset : 0,
		document.documentElement ? document.documentElement.scrollTop : 0,
		document.body ? document.body.scrollTop : 0
	);
}
function f_filterResults(n_win, n_docel, n_body) {
	var n_result = n_win ? n_win : 0;
	if (n_docel && (!n_result || (n_result > n_docel)))
		n_result = n_docel;
	return n_body && (!n_result || (n_result > n_body)) ? n_body : n_result;
}

function vp(){ // tamaño de lo que se esta viendo
 var viewportwidth;
 var viewportheight;
 
 // the more standards compliant browsers (mozilla/netscape/opera/IE7) use window.innerWidth and window.innerHeight
 if (typeof window.innerWidth != 'undefined'){
      viewportwidth = window.innerWidth,
      viewportheight = window.innerHeight
 }else if (typeof document.documentElement != 'undefined'
     && typeof document.documentElement.clientWidth !=
     'undefined' && document.documentElement.clientWidth != 0) { 
	// IE6 in standards compliant mode (i.e. with a valid doctype as the first line in the document)
       viewportwidth = document.documentElement.clientWidth,
       viewportheight = document.documentElement.clientHeight
 } else {// older versions of IE
       viewportwidth = document.getElementsByTagName('body')[0].clientWidth,
       viewportheight = document.getElementsByTagName('body')[0].clientHeight
 }
 return viewportheight
}

function cambiarAlturaTotal(e){
	if ( !!document.getElementById(e) ) document.getElementById(e).style.height = vp() + f_scrollTop() + 'px';
}