<script language="JavaScript"> <!-- image1= new Image(); image1.src = " "; image2= new Image(); image2.src = " "; image3= new Image(); image3.src = " "; function imgchange(){ var imageNum = document.form.selImage.selectedIndex + 1; fname = eval("image" + imageNum + ".src") document.img.src = fname } //--> </script> <form name="form"> <select name="selImage" size=1> <option selected>圖形 1 <option>圖形 2 <option>圖形 3 </select> <input type="button" value="View" onClick="imgchange()" name="button"> </form> <img src=" " name="img" >