// Rollover functions
function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
	function preloadImages() {
		if (document.images) {
			nav_contact_on = newImage("images/nav_contact-on.gif");
			nav_designserver_on = newImage("images/nav_designserver-on.gif");
			nav_history_on = newImage("images/nav_history-on.gif");
			nav_signals_on = newImage("images/nav_signals-on.gif");
			nav_warningsirens_on = newImage("images/nav_warningsirens-on.gif");
			preloadFlag = true;
		}
	}
	
function checkData(Form) {
	var strName = document.frmDetails.Name;
	var strEmail = document.frmDetails.Email;
	var strComments = document.frmDetails.Comments;
		
	if (strName.value == ''){
		alert('Name is required!');
		strName.focus();
		return false;
	}
	
	if (strEmail.value == ''){
		alert('Email is required!');
		strEmail.focus();
		return false;
	}				
}