var tips = 0;
var maxTips = 7;

function openWindow(dest){
   var win = window.open(dest, 'win', '');
   win.focus();
}

function openAdditionalAirbrushInfoWindow(){
   var informationWindow = window.open('airbrushInformation.html', 'information', 'height=482, width=334, scrollbars=no, titlebar=yes, menubar=no, resizable=no, status=no, toolbar=no');
   informationWindow.focus();	
}

function openTipsWindow(){
   var tipsWingow = window.open('tips.html', 'information', 'height=432, width=432, scrollbars=no, titlebar=no, menubar=no, resizable=no, status=no, toolbar=no');
   tipsWindow.focus();	
}

function openClassRegistrationWindow(){
   var registrationWindow = window.open('registration.php', 'information', 'height=482, width=482, scrollbars=yes, titlebar=yes, menubar=no, resizable=no, status=no, toolbar=no');
   registrationWindow.focus();		
}

function getYear(){
   document.write(eval(new Date().getFullYear()));
}

function nextTip(){
   if (tips + 1 > maxTips)
     tips = 0;
   else
     tips++;
   swap();
}

function previousTip(){
   if (tips - 1 < 0)
     tips = maxTips;
   else
     tips--;
   swap();
}

function tipsPosition(){
   return tips;
}

function swap() {
   document['tip'].src = "images/tip-" + tipsPosition() + ".jpg";
}

function changePicture(newPic) {
   document.getElementById("portfolio").src = newPic;
}