function ShowModalDialog (sPath, sStyle, sAddStyle, iWidth, iHeight) {
	if (sStyle == '')
		sStyle = 'edge: Raised;';
	if (sAddStyle == '')
		sAddStyle = 'center: Yes; help: No; resizable: No; status: No; scroll: Yes;';
	if (iWidth == 0)
		iWidth = 420;
	if (iHeight == 0)
		iHeight = 200;
	return window.showModalDialog(sPath, '', 'dialogHeight: ' + iHeight + 'px; dialogWidth: ' + iWidth + 'px; dialogTop: px; dialogLeft: px;' + sStyle + '; ' + sAddStyle);
}

// return the value of the radio button that is checked
// return an empty string if none are checked, or
// there are no radio buttons
function getCheckedValue(radioObj) {
	if(!radioObj)
		return "";
	var radioLength = radioObj.length;
	if(radioLength == undefined)
		if(radioObj.checked)
			return radioObj.value;
		else
			return "";
	for(var i = 0; i < radioLength; i++) {
		if(radioObj[i].checked) {
			return radioObj[i].value;
		}
	}
	return "";
}

// set the radio button with the given value as being checked
// do nothing if there are no radio buttons
// if the given value does not exist, all the radio buttons
// are reset to unchecked
function setCheckedValue(radioObj, newValue) {
	if(!radioObj)
		return;
	var radioLength = radioObj.length;
	if(radioLength == undefined) {
		radioObj.checked = (radioObj.value == newValue.toString());
		return;
	}
	for(var i = 0; i < radioLength; i++) {
		radioObj[i].checked = false;
		if(radioObj[i].value == newValue.toString()) {
			radioObj[i].checked = true;
		}
	}
}