// JavaScript Document
<!--	
//	window.onload = PreLoadImage;
	
	function PreLoadImage(){
		//站点导航--顶部导航栏
		(new Image(126,118)).src = "image/public/navi_bt/a1.jpg";
		(new Image(114,118)).src = "image/public/navi_bt/b1.jpg";
		(new Image(117,118)).src = "image/public/navi_bt/c1.jpg";
		(new Image(84,118)).src = "image/public/navi_bt/d1.jpg";
	}
	
	//页面introduction.asp左侧导航栏MOUSE事件
	function NaviMenu_MouseEvent(){
		var evt = event.srcElement;
		if(evt.tagName=="IMG"&&evt.name=="navimenu"){
			if(evt.src.lastIndexOf("1")>0){
				KeepColor();
			}else{
				evt.src = evt.src.replace("2","1");
			}
		}
	}
	//保持彩色按钮
	function KeepColor(){
		var imgs = document.getElementsByTagName("IMG");
		for(var i=0;i<imgs.length;i++){
			//先
			if(imgs[i].alt!=alt&&imgs[i].name=="navimenu"){//alt全局变量
				imgs[i].src = imgs[i].src.replace("1","2");
			}
			//后
			if(imgs[i].alt==alt&&imgs[i].name=="navimenu"){//alt全局变量
				imgs[i].src = imgs[i].src.replace("2","1");
			}
		}
	}
	
	try{
		with(document){
			onmouseover = NaviMenu_MouseEvent;
			onmouseout = NaviMenu_MouseEvent;
		}
	}catch(e){;}
	
	window.onload = function(){
		PreLoadImage();
		KeepColor();
	}
//-->