var unitCnt = 30;
var loc = window.location.href;
var pos = loc.indexOf(".aspx");	
var curUnit = loc.substr(loc.lastIndexOf("/")-2,2);
var currentStep = loc.substr(pos-1,1)-0;
/*dropdown selection*/
function writeSelect()
{
	document.write("<option value=\"../index.aspx\">Index</option>");
	for (var i=1;i<=unitCnt;i++)
	{
		if (i == curUnit)
		{
			document.write("<option value=\"../lesson" + curUnit +"/1.aspx\" selected>Lesson " + i +" </option>");
		}
		else
		{
			var tStr = "a000" + i;
			tStr = tStr.substr(tStr.length - 2,2);
			document.write("<option value=\"../lesson" + tStr +"/1.aspx\">Lesson " + i +" </option>");
		}
	}
}