var homeNav_const = 26;
var aboutNav_const = 139;
var productNav_const = 310;
var contactNav_const = 505;
function rollOver(thisNav) {
	var rollelement = document.getElementById("navRollOver");
	var markerLeft = (document.body.clientWidth - 960)/2;
	if(markerLeft < 0){
		markerLeft = 0;
	}
	var thisPosition = markerLeft + 385 + eval(thisNav + "_const");
	rollelement.style.left = thisPosition + "px";
	rollelement.style.visibility = "visible";
}
function hideRollOver() {
	var rollelement = document.getElementById("navRollOver");
	rollelement.style.visibility = "hidden";
}
function activeNav(thisNav) {
	var rollelement = document.getElementById("activeNav");
	var markerLeft = (document.body.clientWidth - 960)/2;
	if(markerLeft < 0){
		markerLeft = 0;
	}
	var thisPosition = markerLeft + 385 + eval(thisNav + "_const");
	rollelement.style.left = thisPosition + "px";
	rollelement.style.visibility = "visible";
}
function checkForm(){
	var errorMsg = "";
	if(document.forms.contactUs.firstName.value ==''){
		errorMsg = errorMsg + 'Please enter your name.\n';
	}
	if(document.forms.contactUs.email.value ==''){
		errorMsg = errorMsg + "Please enter your email address.\n";
	} else {
		var emailFilter= /^[-_.a-zA-Z0-9]+@[-_.a-zA-Z0-9]+.[a-zA-Z0-9]+$/;
		if (!(emailFilter.test(document.forms.contactUs.email.value))) {
			errorMsg = errorMsg + "Please enter a valid email address.\n";
		}
	}
	if(document.forms.contactUs.message.value ==''){
		errorMsg = errorMsg + 'Please enter your message.\n';
	}
	if(errorMsg != ""){
		alert(errorMsg);
		return false;
	}
}