function showTab(n){
	var h=document.getElementById("sleek").getElementsByTagName("h4");
	var d=document.getElementById("sleek").getElementsByTagName("div");
	for(var i=0;i<h.length;i++){
		if(n-1==i){
			h[i].className+=" up";
			d[i].className+=" block";
		}
		else {
			h[i].className=" ";
			d[i].className=" ";
		}
	}
}