<form>
<input type="text" name="test" id="test">
<input type="submit" onclick="checkSpace('test')">
</form>
<script language="javascript">
function checkSpace(str)
{
var value = document.getElementById(str).value;
var partn = /^[\S]*$/;
if(!partn.exec(value))
{
alert("true");
}
else{
alert("false");
}
return false;
}
</script>