var ns = (navigator.appName=="Netscape" && parseInt(navigator.appVersion)>=4)?true:false
var ie = (navigator.appName=="Microsoft Internet Explorer" && parseInt(navigator.appVersion)>=4)?true:false
var ns6 = (document.getElementById&&!document.all)

var safari = new String(navigator.appVersion);
var expr=/safari/gi;
Saf = safari.search(expr);

var navigsaf = (Saf!=-1)?true:false;

function getLayer(name) {

  if (ie)
    return eval('document.all.' + name);
	if (ns6)
		return document.getElementById(name);
  return null;
}

function etire(){
	alpha1=getLayer('alpha');
	beta1=getLayer('beta');
	
	if(alpha1.offsetHeight>beta1.offsetHeight){
		beta1.style.height=alpha1.offsetHeight+5 +"px";
	}
}