<script>
<!--
function emailcheck(cur)
{
var string1=cur.email.value
if (string1.indexOf("@")==-1)
{
alert("Please input a valid email address!")
return false
}
}
//-->
</script>
<form onsubmit="return emailcheck(this)">
<strong>Enter your email address please:</strong><br><input type="text" size="20" name="email">
<input type="submit" value="Submit!">
</form>
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