var Browser=window.navigator.appName;
	var sign=0;
	var textHeight,scrollH,picHeight,minHeight;
	var textDistance,DisText,textDisText,Distance,_y,picY;
	var pageNum=1;

	var prevNews=new Object;

	function pageChage(page,max) {
		if (page=="up" && pageNum!=1) {
			document.getElementById("list"+pageNum.toString()).style.display="none";
			document.getElementById("list"+(pageNum-1).toString()).style.display="block";
			pageNum=pageNum-1;
		}
		if (page=="down" && pageNum!=max) {
			document.getElementById("list"+pageNum.toString()).style.display="none";
			alert
			document.getElementById("list"+(pageNum+1).toString()).style.display="block";
			pageNum=pageNum+1;
		}
	}

	function selectNews(obj,num) {
		if (typeof(prevNews.className)=="undefined") {
			if (num=="3") {
				obj.className="product_class_current"+num;
				prevNews=obj;
			} else {
				obj.className="product_class_current";
				prevNews=obj;
			}
		} else {
			if (prevNews.className=="product_class_current3") {
				prevNews.className="product_class_list3";
			} else {
				prevNews.className="product_class_list";
			}
			if (num=="3"){
				obj.className="product_class_current3";
				prevNews=obj;
			} else {
				obj.className="product_class_current";
				prevNews=obj;
			}
		}
	}
	function changeNews(num) {
		document.getElementById("product_position").innerHTML=document.getElementById("product_position" + num).innerHTML;
		document.getElementById("product_title").innerHTML=document.getElementById("product_title" + num).innerHTML;document.getElementById("product_content").innerHTML=document.getElementById("product_content" + num).innerHTML;
		product_scroll_pic.onmousedown = function () {
			info('product_content','product_scroll_pic',138,187);
		}
	}

	function info(text_content,scroll_content,h,t) {
		//alert("w")
		picY=t;
		Distance=0;
		textDistance=0;
		textHeight=document.getElementById(text_content).scrollHeight; //2696
		picHeight=document.getElementById(scroll_content).height;
		scrollH=h-picHeight;//87
		minHeight=(textHeight-h)/(scrollH-5);	// 2696-138/(87-10)
		_y=t; //187
	
		if (document.getElementById(scroll_content).style.top=="") {
			document.getElementById(scroll_content).style.top="0px";
		}				

		if(sign==0){
			document.getElementById(scroll_content).style.marginTop="0px";
			picY=window.event.clientY;
		} else {
			Distance=parseInt(document.getElementById(scroll_content).style.marginTop);
			picY=window.event.clientY;
		}

		//ie
		document.getElementById(scroll_content).ondrag=function(){
			sign=1;
			
			picY=window.event.clientY-picY;
			Distance=Distance+parseInt(picY);

			if (Distance<0) {
				Distance=0;
			}
			if (Distance>(scrollH-5)) {
				Distance=scrollH-5;
			}
			textDistance=Distance*minHeight*(-1);  //  2.3*-1*
			DisText=Distance.toString()+"px";
			textDisText=textDistance.toString()+"px";

			document.getElementById(scroll_content).style.marginTop=DisText;
			document.getElementById(text_content).style.marginTop=textDisText;
			
			picY=window.event.clientY;
		}
	}

	function scrollUp (text_content,scroll_content,h) {
		sign=1;

		if (document.getElementById(scroll_content).style.marginTop=="" || document.getElementById(text_content).style.marginTop=="") {
			document.getElementById(scroll_content).style.marginTop="0px";
			document.getElementById(text_content).style.marginTop="0px";
		}
		
		var tempTextH,tempScrollH,tempMinH,times,smallH,tempTH,tempSH;
		tempTextH=document.getElementById(text_content).scrollHeight
		tempScrollH=h;
		tempMinH=18;
		times=parseInt((tempTextH-tempScrollH)/18);
		smallH=parseInt((tempScrollH-document.getElementById(scroll_content).height)/times);
		
		tempTH=parseInt(document.getElementById(text_content).style.marginTop);
		tempTH=tempTH+tempMinH;
		tempSH=parseInt(document.getElementById(scroll_content).style.marginTop);
		tempSH=tempSH-smallH;
		
		if(tempSH<=0) {
			tempSH=0;
			tempTH=0;
		}
				
		tempTH=tempTH.toString()+"px";
		document.getElementById(text_content).style.marginTop=tempTH;
		tempSH=tempSH.toString()+"px";
		document.getElementById(scroll_content).style.marginTop=tempSH;
	}

	function scrollDown (text_content,scroll_content,h) {
		sign=1;

		if (document.getElementById(scroll_content).style.marginTop=="" || document.getElementById(text_content).style.marginTop=="") {
			document.getElementById(scroll_content).style.marginTop="0px";
			document.getElementById(text_content).style.marginTop="0px";
		}
		
		var tempTextH,tempScrollH,tempMinH,times,smallH,tempTH,tempSH;
		tempTextH=document.getElementById(text_content).scrollHeight
		tempScrollH=h;
		tempMinH=18;
		times=parseInt((tempTextH-tempScrollH)/18);
		smallH=parseInt((tempScrollH-document.getElementById(scroll_content).height)/times);
		
		tempTH=parseInt(document.getElementById(text_content).style.marginTop);
		tempTH=tempTH-tempMinH;
		tempSH=parseInt(document.getElementById(scroll_content).style.marginTop);
		tempSH=tempSH+smallH;
	
		if(tempSH>=(tempScrollH-document.getElementById(scroll_content).height-5)) {
			tempSH=tempScrollH-document.getElementById(scroll_content).height-5;
			tempTH=(tempTextH-tempScrollH)*-1;
		}
				
		tempTH=tempTH.toString()+"px";
		document.getElementById(text_content).style.marginTop=tempTH;
		tempSH=tempSH.toString()+"px";
		document.getElementById(scroll_content).style.marginTop=tempSH;

	}