//轮回显示
 function zahe_1(name,cursel,n)
 { 
	for(i=1;i<=n;i++)
		{ 
			var menu=document.getElementById(name+i); 
			var con=document.getElementById("con_"+name+"_"+i); 
			menu.className=i==cursel?"hover":""; 
			con.style.display=i==cursel?"block":"none"; 
		} 
 } 


//图片的显示大小[宽高同时限制]
function DrawImage(imgObj,widthValue,heightValue){ 
    var image=new Image(); 
    image.src=imgObj.src;
    if(image.width>0 && image.height>0){
		if(image.height>heightValue||image.width>widthValue){
			var h=0,w=0,flg=false;
			
			if((heightValue/image.height)<(widthValue/image.width)){//按高度比例缩放
				if(image.height>heightValue)
                	flg=true;
				if(flg){
                	h=heightValue; 
                	w=(image.width*heightValue)/image.height; 
					
                }
			}else{//按宽度比例缩放
				if(image.width>widthValue)
                	flg=true;
				if(flg){
                	w=widthValue; 
                	h=(image.height*widthValue)/image.width;
                }
			}
			imgObj.width=w; 
            imgObj.height=h; 

        }else{ 
            imgObj.width=image.width; 
            imgObj.height=image.height; 
        }  
    } 
}