function clearCombo(oCombo) {
	var count = oCombo.options.length;
	for (var i = 0; i < count; i++){
		oCombo.remove(0);
	}
}

function addOption(oCombo, value, text) {
	var oOption 	= document.createElement("OPTION");
	oOption.text	= text;
	oOption.value	= value;
	oCombo.options.add(oOption);
}

function comboGetSelectedText(oCombo) {
	for (i = 0; i < oCombo.options.length ; i++) {
		if (oCombo.options[i].selected) {
			return oCombo.options[i].text;
		}
	}
	return null;
}

function selectItemCombo(oCombo,sValue) {
		for (i = 0; i < oCombo.options.length ; i++) {
			if (oCombo.options[i].value == sValue) {
				oCombo.options[i].selected = true;
			}
		}
}

function messagePreview(url) {
  window.open(url, 'preview', 'width=750, height=800, scrollbars=no, menubar=no, location=no, resizable=no');
}