function changeActivityGroup(obj){
	if(obj.options[obj.selectedIndex].value!=""){
		document.getElementById("frmActivity").src = "selectPhysicalActivityDsp.cfm?id="+obj.options[obj.selectedIndex].value;
		document.getElementById("spanActivity").style.display = "";
	} else {
		document.getElementById("spanActivity").style.display = "none";
	}
}

function calculateCal(){
	cweight = document.getElementById("ActivityWeight").value/2.2;
	cMETS = document.getElementById("METS").value;
	//chours = document.getElementById("Hours").options[document.getElementById("Hours").selectedIndex].value;
	chours = document.getElementById("Hours").selectedIndex
	cminutes = document.getElementById("minutes").options[document.getElementById("minutes").selectedIndex].value;
	partialHour = eval(cminutes/60);
	chours = chours + partialHour
	
	calories = Math.round(cweight*cMETS*chours);
	document.getElementById("spanCalories").innerHTML = calories + " calories.";
}