window.onload = function(){
	var timer;
	var elem = document.getElementById('elem');
	var elem1 = document.getElementById('elem1');
	var elem2 = document.getElementById('elem2');
	elem2.innerHTML = elem1.innerHTML;
	timer = setInterval(Scroll,20);
	function Scroll(){
		if(elem.scrollTop>=elem1.offsetHeight){
			elem.scrollTop -= elem1.offsetHeight;
		}else{
			elem.scrollTop += 1;
		}
	}	
	elem.onmouseover = function(){
		clearInterval(timer);
	}	
	elem.onmouseout = function(){
		timer = setInterval(Scroll,20);
	}
}
function go_to(num){
		var spans = document.getElementById("tab").getElementsByTagName("span");
		var em = document.getElementById("tab").getElementsByTagName("em")[0];
		for(var i=0;i<spans.length;i++){
			spans[i].className = "";
			document.getElementById("con"+(i+1)).style.display = "";
		}
		document.getElementById("sp"+num).className = "up";
		document.getElementById("con"+num).style.display = "block";
		if(num==1){
			em.style.background = "url(images/hd.jpg)";	
			em.style.height = "29px";
			em.style.top = "9px";
		}else{
			em.style.background  = "url(images/hd1.jpg)";	
			em.style.height = "27px";
			em.style.top = "11px";
		}
	}