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function layervib(type,num){
var H=type;
var temp=(H='visible'?'hidden':'visible')
for(var i=0;i<mainLayer.length;i++){
var E=eval('document.all.index'+i+'.style');
var H=eval(i);
if(i==num){E.visibility=type}else{E.visibility=temp};
}
}

function switchCell(n) {
	for(i=0;i<navcell.length;i++){
		navcell[i].className="tab-off";
		tb[i].style.display="none";
	}
	navcell[n].className="tab-on";
	tb[n].style.display="block";
	//tb_content.height=screen.availHeight-tb_header.clientHeight-tb_navbar.clientHeight-tb_footer.clientHeight-64;
}