이미지 업로드시 미리보기 기능

<script language=javascript>
    <!--
        function SignChange(form)
        {
            var defaultSign = "../images/sample.gif";           //기본이미지
            if(form.SignSearch.value != '')
                form.SignImage.src = form.SignSearch.value;
            else
                form.SignImage.src = defaultSign;
        }
    //-->
    </script>
 
<form name=form1 method=post>
<IMG height="50" src="../images/sample.gif" width="50" id="SignImage"><br>

<input class="base" id="SignSearch" type="file" size="20" name="SignSearch"

onpropertychange="SignChange(this.form)">
</form>