签写留言时头相头像选择的一段Javascript代码:(很有用的哦)function showimage(value){ if(value!= '') { document.images.useravatars.src='images/'+value; } else{ document.images.useravatars.src=http://www.abcdown.net/InfoView/images/none.gif; }}对应的HTML语句的书写: <select name="face" onChange='showimage(this.options[this.selectedIndex].value)'> <option value="http://www.abcdown.net/InfoView/f01.gif" >boy1</option> <option value="http://www.abcdown.net/InfoView/f02.gif">boy2</option> <option value="http://www.abcdown.net/InfoView/f07.gif" selected>boy7</option> </select> <img name=useravatars src=http://www.abcdown.net/InfoView/images/f07.gif height=100 width=100 border=0> 效果查看:PHP">http://free1.e-168.cn/huqing/guestbook/write.php