function checkBrowser(){
	this.ver=navigator.appVersion
	this.dom=document.getElementById?1:0
	this.ie5=(this.ver.indexOf("MSIE 5")>-1 && this.dom)?1:0;
	this.ie4=(document.all && !this.dom)?1:0;
	this.ns5=(this.dom && parseInt(this.ver) >= 5) ?1:0;
	this.ns4=(document.layers && !this.dom)?1:0;
	this.bw=(this.ie5 || this.ie4 || this.ns4 || this.ns5)
	return this
}

bw=new checkBrowser()

function showhide(div,nest){
	obj=bw.dom?document.getElementById(div).style:bw.ie4?document.all[div].style:bw.ns4?nest?document[nest].document[div]:document[div]:1; 
	if(obj.display=='block' || obj.display=='block') obj.display='none'
	else obj.display='block'
}

function reveal(t,n) {
   // hide images image0 to inagen inclusive and show image t
   for  (i=1; i<=n; i++) {
      hide("image"+i);
   }
   show("image"+t);
}

function show(div,nest){
	obj=bw.dom?document.getElementById(div).style:bw.ie4?document.all[div].style:bw.ns4?nest?document[nest].document[div]:document[div]:0; 
	obj.display='block'
}

function hide(div,nest){
	obj=bw.dom?document.getElementById(div).style:bw.ie4?document.all[div].style:bw.ns4?nest?document[nest].document[div]:document[div]:0; 
	obj.display='none'
}

// pop up window function url, name, width, height
function popupwin(u,n,x,y){
window.open(u,n,'toolbar=no,location=no,directories=no,status=yes,menubar=no,resizable=yes,copyhistory=no,scrollbars=yes,width='+x+',height='+y);
}
function closewin() {window.close();}