js比例缩小显示图片

设定图片最大允许显示的尺寸

1. <SCRIPTLANGUAGE="JavaScript">
2. <!--
3. functionDownImage(ImgD,MaxWidth,MaxHeight){
4. varimage=newImage();
5. image.src=ImgD.src;
6. if(image.width>0&&image.height>0){
7. varrate=(MaxWidth/image.width<MaxHeight/image.height)?MaxWidth/image.width:MaxHeight/image.height;
8. if(rate<=1){
9. ImgD.width=image.width*rate;
10. ImgD.height=image.height*rate;
11. }
12. }
13. }
14. //-->
15. </SCRIPT>

<img src="1.jpg" border="0" id="img" onload="DownImage(this,130,130);"/>