//图片等比缩放功能
function resizeimg(ImgD,iwidth,iheight)
{
     var image=new Image();
     image.src=ImgD.src;
     if(image.width>0 && image.height>0)
	 {
        if(image.width/image.height>= iwidth/iheight)
		{
           if(image.width>iwidth)
		   {
               ImgD.width=iwidth;
               ImgD.height=(image.height*iwidth)/image.width;
           }
		   else
		   {
                  ImgD.width=image.width;
                  ImgD.height=image.height;
           }
        }
        else
		{
			if(image.height>iheight)
			{
			   ImgD.height=iheight;
			   ImgD.width=(image.width*iheight)/image.height;
			}
			else
			{
				ImgD.width=image.width;
				ImgD.height=image.height;
			}
             
        }
    }
}

//分类特效
function pcclick(obj,num)
{
	for(var i = 1; i <=num; i++)
	{
		var pp = "pc" + i;
		if(document.getElementById(pp).style.display == "none" && pp == obj)
		{
			document.getElementById(pp).style.display = "";
		}
		else
		{
			document.getElementById(pp).style.display = "none";
		}	
	}
}