var active;
var section;
var ie = (document.all) ? true: false; 
var isWin = (navigator.platform.indexOf("Win") != -1) ? true : false;
var ieWin = (ie && isWin) ? true : false;
var ieWin50 = (isWin && navigator.appVersion.indexOf('MSIE 5.0') != -1) ? true : false;
window.onload=function(){
chooseTab(1);
}

function tr(ttab,tbox) {
	this.ttab = ttab
	this.tbox = tbox
}	
var tab = new Array()
tab[0] = new tr(null,null);
tab[1] = new tr(getStyleObj('tab1'),getStyleObj('bx1'));
tab[2] = new tr(getStyleObj('tab2'),getStyleObj('bx2'));
tab[3] = new tr(getStyleObj('tab3'),getStyleObj('bx3'));
tab[4] = new tr(getStyleObj('tab4'),getStyleObj('bx4'));
tab[5] = new tr(getStyleObj('tab5'),getStyleObj('bx5'));



function getStyleObj(elem,parent) {
	if (document.layers) {
	    if (parent) {
			return "document."+parent+".document."+elem;
	    }
	    else {
			return "document."+elem + ".style";
		}		
	} 
	else if (document.all) {
		return "document.all."+elem + ".style";
	} 
	else if (document.getElementById) {
		return "document.getElementById('"+elem+"').style";		
	}
}
function chooseTab(num) {
	if (document.all || document.getElementById) { 
		if (active) {
			activeboxlayer = eval(tab[active].tbox);
			activetabtext = eval(tab[active].ttab);	
			activetabtext.textDecoration="underline";
			activetabtext.textWeight="normal";
			activeboxlayer.visibility="hidden";
			activeboxlayer.zIndex = 0;
		}
		boxlayer = eval(tab[num].tbox);	
		tabtext = eval(tab[num].ttab);	
		boxlayer.visibility="visible";
		tabtext.textDecoration="none";
		tabtext.textWeight="bold";
		boxlayer.zIndex = 10;
		active = num;
	}
}