function findObj(n) {
	//finds a reference to a form object when passed a name
  	var p,i,x, d;
  	d=document;
  	if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);
    }
  	if(!(x=d[n])&&d.all) x=d.all[n];
  	for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
	for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);

	return x;
}

function getSelectedButton(buttonGroup){

		for (var i = 0; i < buttonGroup.length ; i++) {
			if (buttonGroup[i].checked) {
				return i
			}
		}
		return -1
	}

function roundNum (expr, decplaces) {
	var str = "" + Math.round(eval(expr) * Math.pow(10, decplaces));
	while (str.length <= decplaces) {
		str = "0" + str
	}
	var decpoint = str.length - decplaces
	return str.substring(0, decpoint) + "." + str.substring(decpoint, str.length);
}

function RequireTextField(fieldname, Message) {
		var field = findObj(fieldname);
		if (field.value == "") {
			alert(Message);
			field.focus();
			return false;
		}
		return true;
	}

function RequireSelectField(fieldname, Message) {
		var field = findObj(fieldname);
		var choice;
		choice = field.selectedIndex;

		if (choice <= 0) {
			alert(Message);
			field.focus();
			return false;
		}
		return true;
	}

function RequireRadioField(fieldname, Message) {
		var field = findObj(fieldname);
		var choice = getSelectedButton(field);
		if (choice == -1){
			alert(Message);
			return false;
		}
		return true;
	}