var ie4 = (document.all && !document.getElementById) ? true : false;
var ie5 = (document.all && document.getElementById) ? true : false;
var ns6 = (!document.all && document.getElementById) ? true : false;
var ns4 = (document.layers) ? true : false;

var helpDlg = null;
var dt_started = false;

function HelpTool (mapX_min, mapY_min, mapWidth, mapHeight) {
	this.start = helptoolStart;
	this.stop = helptoolStop;
}


function helptoolStart() {
	if (!dt_started) dt_started = true;
	helptoolOpenDialog();
}
function helptoolStop() {
	dt_started = false;
	helptoolCloseDialog();
}

function helptoolOpenDialog() {
	if (helpDlg != null) {
		helpDlg.focus();
		return;
	} else {
		if (ie4 || ie5 || ns6) {
			helpDlg = OpenHelpWindow();
		} else if (ns4) {
			helpDlg = OpenHelpWindow();
		//	helpDlg = window.open(maptoolURL + '../help/help_index.asp?BrugerID=0', 'HelpWindow', 'resizable=no,toolbar=no,status=no,menubar=no,location=no,width=170,height=100,top=40,left=100');		
		}
	}
}
	
	
function helptoolCloseDialog () {
	if (helpDlg != null) {
		helpDlg.close();
		helpDlg = null;
		if (dt_started) {
			deselectTool();
		}
	}
}