function selecttab(obj){
	var n = 0;
	var tabs = obj.parentNode.parentNode.getElementsByTagName("li"); 
	for(i=0; i<tabs.length; i++){
		tmp = tabs[i].getElementsByTagName("a")[0];
		if(tmp == obj){
			tmp.className="selected";
			n=i;
		}else{
			tmp.className="";
		}
 	}
	var contents = obj.parentNode.parentNode.parentNode.parentNode.getElementsByTagName("div")[1].getElementsByTagName("div");
	for(i=0; i<contents.length; i++){
		contents[i].style.display = i==n ? "block" : "none";   
 	}
}