function sw(objName,onoff) {
	var e = document.getElementById(objName);
	if (onoff == 1) {
	
		if (e.overFileName == null) {
			e.myFileName = e.src;
			var extStart = 0;
			if (e.src.indexOf(".gif") > 1) {
				extStart = e.src.indexOf(".gif");
			} else if (e.src.indexOf(".jpg") > 1) {
				extStart = e.src.indexOf(".jpg");
			} else {
				extStart = e.src.indexOf(".png");
			}
			var overFileName = e.src.substr(0,extStart) + "_over" + e.src.substr(extStart,e.src.length);
			e.overFileName = overFileName;
		}

		e.src = e.overFileName;
		
	} else {
		e.src = e.myFileName;
	}
}

function openWin(url,w,h) {
	
	window.open(url,"erd","height=" + h + ",width=" + w + ",menubar=no,toolbar=no,scrollbars=yes,titlebar=no");
	
}

function fixMail(obj) {
	
	originalString = obj.href;
	newString = originalString.substr(0,originalString.length-5);
	newString += "er-d.org";
	obj.href = newString;
	
}

function showDiv(divID) {
	
	var e = document.getElementById(divID);
	e.style.display = "block";
	
}

function hideDiv(divID) {
	
	var e = document.getElementById(divID);
	if (e != undefined) e.style.display = "none";
	
}

function checkAll(myForm,idName) {
	
	var checkValue = myForm["all_" + idName].checked;
	
	for (i=0; i<myForm.elements.length; i++) {
		if (myForm.elements[i].type == "checkbox" && myForm.elements[i].name == idName)
		 	myForm.elements[i].checked = checkValue;
	}	
	
}

function checkAllVerify(myForm,idName) {

	for (i=0; i<myForm.elements.length; i++) {
		if (myForm.elements[i].type == "checkbox" && myForm.elements[i].name == idName && !myForm.elements[i].checked) {
			myForm["all_" + idName].checked = false;
			break;			
		}
		
	}	
	

}

function checkForm(myForm) {
	
	var regionChecked = false;
	var footageChecked = false;
	var errorText = "";

	for (i=0; i<myForm.elements.length; i++) {

		if (myForm.elements[i].type == "checkbox" && myForm.elements[i].name == "regionID[]" && myForm.elements[i].checked) regionChecked = true;
		if (myForm.elements[i].type == "checkbox" && myForm.elements[i].name == "areaID[]" && myForm.elements[i].checked) footageChecked = true;

	}
	
	if (!footageChecked) errorText += "You must select at least one square footage.\n";
	if (!regionChecked) errorText += "You must select at least one region.";
	
	if (footageChecked && regionChecked) myForm.submit();
	else alert(errorText);
		
}