Clear contents of a combo in JavaScript
	function ComboClear(ComboName)
	{
	for (var ComboCtr = ComboName.options.length - 1; ComboCtr >= 0; ComboCtr--)
	{
	ComboName.options[ComboCtr] = null;
	}
	ComboName.selectedIndex = -1;
	}

	Add value to a combo dynamically in JavaScript
	function ComboAddElement(ComboName, OptionValue)
	{
	oNewOption = new Option();
	oNewOption.text = OptionValue;
	ComboName.add(oNewOption, 1);
	}

	Retrieve Query String values in JavaScript
	function getFieldValue (strFieldName)
	{
	var strFieldValue;
	var objRegExp = new RegExp(strFieldName + "=([^&]+)","gi");
	if (objRegExp.test(location.search))
	strFieldValue = unescape(RegExp.$1);
	else strFieldValue="";
	return strFieldValue;
	}
	Download the JavaScript QueryString sample

	Block Right Click in JavaScript
	function BlockRightClick()
	{
	if (event.button == 2)
	{
	alert('This functionality is not supported!');
	}
	document.onmousedown = BlockRightClick
	}