说明:

效果:

代码:

<img src="http://s5.20t.net/webdata/media/image/image.png" name="u" border="1" alt="很好玩的">
<script language="JavaScript">

var b = 1;
var c = true;

function www_help(){
if(document.all);

if(c == true) {
b++;
}
if(b==100) {
b--;
c = false
}

if(b==10) {
b++;
c = true;
}

if(c == false) {
b--;
}
u.width=150 + b;
u.height=125 - b;
setTimeout("www_help()",50);
}
www_help();
</script>