var mactivity = new Array();
var mweight;
var mminutes;

function MHowMany(MActivityBurn) {
	var mburn;
	var mkilograms;
	//var mpounds;
	var mweight_entered;
	var mminutes_entered;

	mburn_value = MActivityBurn.mactivity.options[MActivityBurn.mactivity.selectedIndex].value;
	//split combined dropdown value
	mburn_value = mburn_value.split("~")[0];
	mweight_entered = Math.round(MActivityBurn.mcurweight.value);
	mweight_entered = Math.round(mweight_entered)
	mminutes_entered = MActivityBurn.mduration.value;

	if (isNaN($("mduration").value) || $("mduration").value == "") {
		alert("Please supply a valid numeric value for the workout duration!");
		$("mduration").focus();
		$("mduration").select();
		return false;
	}

	if (isNaN($("mcurweight").value) || $("mcurweight").value == "") {
		alert("Please supply a valid numeric value for your weight!");
		$("mcurweight").focus();
		$("mcurweight").select();
		return false;
	}
	
//	if (mburn_value == "" || mweight_entered == "" || mminutes_entered == "") {
//		alert("Please enter all required data!");
//		MActivityBurn.mduration.focus();
//		return false;
//	}
	else {

		mkilograms = Math.round(mcurweight);
		//mpounds=mkilograms * 2.2;
		mhours = mduration / 60.0;
		mburn = Math.round(mburn_value * mkilograms * mhours);
	}

	MActivityBurn.MFdiff.value = mburn;
	//MActivityBurn.mpounds.value = eval(mpounds);
	return true;
}

function MSetWeight(mweight) {
	mcurweight = Math.round(mweight.value);
}
function MSetDuration(mminutes) {
	mduration = mminutes.value;
}

function openBrWindow(theURL, winName, features) {
	window.open(theURL, winName, features);
}