/* 
功能：图片等比例缩放 
目标:ImgTag 
图片宽度:FitWidth 
图片高度:FitHeight 
*/ 
var FitWidth = 100; 
var FitHeight = 108; 
function ResizePic(ImgTag) 
{ 
var image = new Image(); 
image.src = ImgTag.src; 
if(image.width>0 && image.height>0){ 
if(image.width/image.height >= FitWidth/FitHeight){ 
if(image.width > FitWidth){ 
ImgTag.width = FitWidth; 
ImgTag.height = (image.height*FitWidth)/image.width; 
} 
else{ 
ImgTag.width = image.width; 
ImgTag.height = image.height; 
} 
} 
else{ 
if(image.height > FitHeight){ 
ImgTag.height = FitHeight; 
ImgTag.width = (image.width*FitHeight)/image.height; 
} 
else{ 
ImgTag.width = image.width; 
ImgTag.height = image.height; 
} 
} 
} 
}