removing space in javascript

<script type="text/javascript">
function removeSpace(){
	document.getElementById('myText').value = document.getElementById('myText').value.replace(" ","");	
}
</script>

<input type="text" id="myText" />
<input type="button" onclick="removeSpace()" value="Remove Space" />

var el = document.getElementsByName("10010input")[0];
var val = el.value.replace(/\s/g, "");
alert(val)

<script language="javascript">

String.prototype.ltrim = function() {
return this.replace(/^\s+/,"");
}
$(function(){
    $("#idOfTextBoxHere").keyup(function(){
      $(this).val( $(this).val().ltrim());
    });
});

</script>