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

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


function newImage(arg) {
  if (document.images) {
    rslt = new Image();
    rslt.src = arg;
    return rslt;
  }
}
var preloadFlag = false;




function preloadImages() {
  if (document.images) {
    home_on = newImage("./images/home_.jpg");
    profile_on = newImage("./images/profile_.jpg");
    schedule_on = newImage("./images/schedule_.jpg");
    news_on = newImage("./images/news_.jpg");
    gallery_on = newImage("./images/gallery_.jpg");
    sponsors_on = newImage("./images/sponsors_.jpg");
    links_on = newImage("./images/links_.jpg");
    contact_on = newImage("./images/contact_.jpg");
    preloadFlag = true;
  }
}


 function showpicture(url,width, height)
{
        LeftPosition=(screen.width)?(screen.width-width)/2:100;
     TopPosition=(screen.height)?(screen.height-height)/2:100;
        var Win = window.open(url,'showpic','width=' + width + ',height=' + height + ',top='+TopPosition+',left=' +LeftPosition +',resizable=0,scrollbars=no,menubar=no,toolbar=no,status=no')
}

function check_contact_form() {

	if (document.contact_form.cfirstname.value=="" || 
		document.contact_form.cemail.value=="" ||	
		document.contact_form.csurname.value=="") {
		alert ('All fields marked with * are required!');
		return false;
	}
	else {
		return true; 
	}
}