function detectBrowser() {
var ie = document.all != undefined;
var opera = window.opera != undefined;

if (opera) return "opera";
if (ie) return "ie";
if ((window)&&(window.netscape)&&(window.netscape.security)) {
  if (window.XML) {
	return "firefox15";
  }
  else return "firefox10";
}
return "ie";      // Si no sabemos que navegador es, devolvemos ie.
}
var algo = detectBrowser();
if (algo!="ie" && algo!="opera"){
	if(document.getElementById('Div_BgLeft')) {
	d = document.getElementById('Div_BgLeft');
	if(document.getElementById('Div_MainBody')) {
		d2 = document.getElementById('Div_MainBody');
		d.style.height = d2.offsetHeight + 'px';	
	}
} 
}