<FORM name="form">
<SELECT NAME="selImage" size=1 onchange="img.src=this.value +'.gif';">
<OPTION value=1>头像1
<OPTION value=2>头像2
<OPTION value=3>头像3
<OPTION value=4>头像4
<OPTION value=5>头像5
<OPTION value=6>头像6
<OPTION value=7>头像7
<OPTION value=8>头像8
</SELECT>&nbsp;<IMG SRC="1.gif" NAME="img">
</FORM>