function changeClass(i,c){
 if(document.all) document.all(i).className=c;
 else if(document.getElementById)
  document.getElementById(i).className=c; 
}
function activeTab(){
	var url=document.URL;
	if(url.indexOf("pottery",0)>0){
		changeClass('tab_pottery','tab-on');
	}else if(url.indexOf("wood",0)>0){
		changeClass('tab_wood','tab-on');
	}else if(url.indexOf("glass",0)>0){
		changeClass('tab_glass','tab-on');
	}else if(url.indexOf("cloth",0)>0){
		changeClass('tab_cloth','tab-on');
	}else if(url.indexOf("paper",0)>0){
		changeClass('tab_paper','tab-on');
	}
}