/*按比例生成缩略图*/
function DrawImage(MyPic,W,H){
  var flag=false;
  var image=new Image();
  image.src=MyPic.src;
  if(image.width>0 && image.height>0){
    flag=true;
    if(image.width/image.height>= W/H){
      if(image.width>W){  
        MyPic.width=W;
        MyPic.height=(image.height*W)/image.width;
      }
	  else{
        MyPic.width=image.width;  
        MyPic.height=image.height;
      }
    }
    else{
      if(image.height>H){  
        MyPic.height=H;
        MyPic.width=(image.width*H)/image.height;     
      }
	  else{
        MyPic.width=image.width;  
        MyPic.height=image.height;
      }
    }
  }
} 

function secBoard(n)
{
for(i=0;i<menu.childNodes.length;i++)
menu.childNodes[i].className="on1";
menu.childNodes[n].className="on2";
}

//调用向左滚动 
//toleft("demo","demo1","demo2",30,"ti1") 
//调用向右滚动 
//toright("demo0","demo11","demo22",20,"ti2") 

//向左滚动函数，demo包含demo1与demo2,speed是滚动速度，flag一个网页内有多个时设置为不同的任意字符。 
function toleft(demo,demo1,demo2,speed,flag) 
{ 
demo=document.getElementById(demo); 
demo1=document.getElementById(demo1); 
demo2=document.getElementById(demo2)
demo2.innerHTML=demo1.innerHTML 
function Marquee() 
{ 
if(demo2.offsetWidth-demo.scrollLeft<=0) 
{ 
demo.scrollLeft-=demo1.offsetWidth 
} 
else 
{ 
demo.scrollLeft++ 
} 
} 
flag=setInterval(Marquee,speed) 
demo.onmouseover=function() 
{ 
clearInterval(flag); 
} 
demo.onmouseout=function() 
{ 
flag=setInterval(Marquee,speed); 
} 
} 


//向右滚动函数，demo包含demo1与demo2,speed是滚动速度，flag一个网页内有多个时设置为不同的任意字符。 
function toright(demo,demo1,demo2,speed,flag) 
{ 
demo=document.getElementById(demo); 
demo1=document.getElementById(demo1); 
demo2=document.getElementById(demo2)
demo2.innerHTML=demo1.innerHTML 
function Marquee() 
{ 
if(demo.scrollLeft<=0) 
{ 
demo.scrollLeft=demo2.offsetWidth 
} 
else 
{ 
demo.scrollLeft-- 
} 
} 
flag=setInterval(Marquee,speed) 
demo.onmouseover=function() 
{ 
clearInterval(flag); 
} 
demo.onmouseout=function() 
{ 
flag=setInterval(Marquee,speed); 
} 
}