/*按比例生成缩略图*/
function DrawImage(ImgD,W,H){ 
  var flag=false; 
  var image=new Image(); 
  image.src=ImgD.src; 
  if(image.width>0 && image.height>0){ 
    flag=true; 
    if(image.width/image.height>= W/H){ 
      if(image.width>W){
        ImgD.width=W; 
        ImgD.height=(image.height*H)/image.width; 
      }
	  else{ 
        ImgD.width=image.width;
        ImgD.height=image.height; 
      } 
      ImgD.alt= ""; 
    } 
    else{ 
      if(image.height>H){
        ImgD.height=H; 
        ImgD.width=(image.width*W)/image.height; 
      }
	  else{ 
        ImgD.width=image.width;
        ImgD.height=image.height; 
      } 
      ImgD.alt=""; 
    } 
  }
}
/*无间滚动*/
function boxmove(d1,d2,d3){ 
    var speed=30; 
    var demo=document.getElementById(d1);  
    var demo1=document.getElementById(d2);  
    var demo2=document.getElementById(d3); 
    demo2.innerHTML=demo1.innerHTML;  
    function boxLeft(){ 
		if(demo2.offsetWidth-demo.scrollLeft<=0){demo.scrollLeft-=demo1.offsetWidth} 
		else{demo.scrollLeft++} 
        } 
	var MoveLeft=setInterval(boxLeft,speed) 
	demo.onmouseover=function(){clearInterval(MoveLeft)} 
	demo.onmouseout=function(){MoveLeft=setInterval(boxLeft,speed)} 
}