Something

<script type="text/javascript">

Array.prototype.removeKeyword = function(val)
{
	var i, len = this.length;
	var new_a = [];
	
	for ( i = 0; i < len; i++ )
		if ( this[i] != val )
			new_a.push( this[i] );

	return( new_a );
}

var my_arr = ["one", "two", "three"];

my_arr = my_arr.removeKeyword("two");

alert(my_arr.join("\n"));

</script>