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<script type="text/javascript" language="javascript">
         function CheckInput() {
             if (document.form1.txt_ReceiptID.value == "") {
                 alert('±¨Ïúµ¥ºÅ²»ÄÜΪ¿Õ!');
                 document.form1.txt_ReceiptID.focus();
                 return false;
             }
             else {
                    if(checknumber(document.form1.txt_ReceiptID.value)
                    {
                        alert("±¨Ïúµ¥ºÅΪÊý×Ö£¡");                       
                         document.form1.txt_ReceiptID.focus();
                         return false;
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event.srcElement.type 
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<head runat="server">
<script type='text/javascript' language="javascript">
<!—
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//-->
</script>
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<html xmlns="http://www.w3.org/1999/xhtml">
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