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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>1 </title>
<script>
function myclick(id)
{
if(document.getElementById(id).value == "")
{
alert("不能为空!");
document.getElementById(id).focus();
return false;
}
else
{
return true;}
}
</script>
</head>
<body>
<form name="form1" method="post" action="xx.jsp">
<label>
<input type="text" name="textfield" id="t">
<input type="button" name="ck" value="提交" onClick="return myclick('t')"> <BR>
<input type="text" name="textfield" id="t1">
<input type="button" name="ck" value="提交" onClick="return myclick('t1')"> <BR>
<input type="text" name="tecxtfield" id="t2">
<input type="button" name="ck" value="提交" onClick="return myclick('t2')">
</label>
</form>
</body>
</html>