function rolloverButton (id, state) {
  if (document.getElementById) {
    var element_id = document.getElementById(id);
	if (state == 'over') {
    element_id.className = 'btnhover'
  }else{
    element_id.className = 'btn'
	}
    }
}


function openWindow(windowURL, windowName, winWidth, winHeight){
   var resolutionX = screen.availWidth;
   var resolutionY = screen.availHeight;
   var positionX = (resolutionX / 2) - (parseInt(winWidth) / 2);
   var positionY = (resolutionY / 2) - (parseInt(winHeight) / 2);
   window.open(windowURL, windowName, 'width=' + winWidth + ',height=' + winHeight + ',status=no,left=' + positionX + ',top=' + positionY + ',screenX=' + positionX + ',screenY=' + positionY + ',toolbar=no,menubar=no,resizable=no,scrollbars=yes');
}