function toggleClassName( event, elem, onStr, offStr )
{
	var elem = document.getElementById( elem.id );
	elem.className = ( event.type == 'mouseover' ) ? elem.id + onStr : elem.id + offStr;
}
function toggle( event, elem )
{
	toggleClassName( event, elem, ' on', ' off' );
}
function swapImage( event, elem )
{
	toggleClassName( event, elem, '_on', '' );
}
function openWindow( url, winWidth, winHeight ) 
{
	try
	{
		var left = ( ( screen.width - winWidth ) / 2 );
		var top = ( ( screen.height - winHeight ) / 2 );
		var theWin = window.open( url, 'results', 'toolbar=no,locationbar=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=no,copyhistory=no,width=' + winWidth + ',height=' + winHeight + ',left=' + left + ',top=' + top );
		theWin.focus();
	}
	catch ( ex )
	{
		debug( "exception thrown : " + ex.message );
	}
}
function swap(name, flag, imgPath)
{
	var state = (flag) ? '_on' : '';
	var srcPath = imgPath + name + state + '.jpg';
	document.getElementById(name).src = srcPath;
}

var message;
var hasErrors;
function validateContactForm()
{
	hasErrors = false;
	message = "Please complete the following field(s):\n\n";
	checkField(document.forms[0].realname.value, "Your Name");
	checkEmailField(document.forms[0].email.value, "E-mail address");
	checkField(document.forms[0].subject.value, "Subject");
	checkField(document.forms[0].message.value, "Text of message");
	
	if (hasErrors)
	{
		alert(message);
		return false;
	}

	return true;
}
function checkField(fieldValue, fieldName)
{
	if (fieldValue == null || fieldValue.length < 1)
	{
		message += "* " + fieldName + "\n";
		hasErrors = true;
	}
}
function checkEmailField(fieldValue, fieldName)
{

	if (fieldValue == null || fieldValue.length < 1 || fieldValue.indexOf(".") == -1 || fieldValue.indexOf("@") == -1)
	{
		message += "* " + fieldName + "\n";
		hasErrors = true;
	}
}

function init()
{
	registerEvent('home','w_02');
	registerEvent('about','w_03');
	registerEvent('services','w_04');
	registerEvent('partners','w_05');
	registerEvent('contact','w_06');
}
function registerEvent(name, id)
{
	var over = function() { swap(id,true,'images/'); }
	var out = function() { swap(id,false,'images/'); }
	document.getElementById(name + 'Link').onmouseover = over;
	document.getElementById(name + 'Pic').onmouseover = over;
	document.getElementById(name + 'Link').onmouseout = out;
	document.getElementById(name + 'Pic').onmouseout = out;
}

window.onload = init;