var pic=new Array(8);
picover=new Array(8);
pic[1]=new Image(171,29);
pic[2]=new Image(171,29);
pic[3]=new Image(171,29);
pic[4]=new Image(171,29);
pic[5]=new Image(171,29);
pic[6]=new Image(171,29);
pic[7]=new Image(171,29);
picover[1]=new Image(171,29);
picover[2]=new Image(171,29);
picover[3]=new Image(171,29);
picover[4]=new Image(171,29);
picover[5]=new Image(171,29);
picover[6]=new Image(171,29);
picover[7]=new Image(171,29);
function prepic(){
    pic[1].src="img/gproduct.jpg";
	pic[2].src="img/news.jpg";
	pic[3].src="img/buy.jpg";
	pic[4].src="img/qyfa.jpg";
	pic[5].src="img/qddl.jpg";
	pic[6].src="img/khsq.jpg";
	pic[7].src="img/hwzc.jpg";
    picover[1].src="img/gproduct_over.jpg";
	picover[2].src="img/news_over.jpg";
	picover[3].src="img/buy_over.jpg";
	picover[4].src="img/qyfa_over.jpg";
	picover[5].src="img/qddl_over.jpg";
	picover[6].src="img/khsq_over.jpg";
	picover[7].src="img/hwzc_over.jpg";
}
/*
function showmenu_item(sid)
{
	which = eval("left_menu_" + sid);
	if (which.style.display == "none")
	{
		var i = 1
		while(i<8){
			eval("left_menu_"+ i +".style.display=\"none\";");
			tcchbl=eval("menu_pic_"+i);
			tcchbl.src=pic[i].src;
			i++;
		}
		eval("left_menu_" + sid + ".style.display=\"\";");
		tcchbl=eval("menu_pic_"+sid);
		tcchbl.src=picover[sid].src;
	}else{
		eval("left_menu_" + sid + ".style.display=\"none\";");
	}
}
*/

function showmenu_item(sid)
{
	if (document.getElementById("left_menu_" + sid).style.display == "none")
	{
		var i = 1
		while(i<8){
			document.getElementById("left_menu_" + i).style.display = "none";
			//tcchbl=eval("menu_pic_"+i);
			tcchb1=document.getElementById("menu_pic_"+i);
			//tcchbl.src=pic[i].src;
			tcchb1.src=pic[i].src;
			i++;
		}
		document.getElementById("left_menu_" + sid).style.display = "";
		//tcchbl=eval("menu_pic_"+sid);
		tcchb1=document.getElementById("menu_pic_"+sid);
		//tcchbl.src=picover[sid].src;
		tcchb1.src=picover[sid].src;
	}else{
		document.getElementById("left_menu_" + sid).style.display = "none";
	}
}