var backNum=0
		var linkBackNum=0
		var	prev=""
		function backCalcLink(loc)
		{
			window.location.href=loc;
			
			if(loc!=prev){
				linkBackNum=linkBackNum+1;
				}
							
			prev=loc;
		}

		function backCalc()
		{
			backNum=backNum+1;
			window.location.href="#top";
		}