// JavaScript Document
// global fnctions
function popup_window( url, width, height )
{
  var x = 0;
  var y = 0;
  if (screen.width > width) {
	x = (screen.availWidth - width)/2;
	y = (screen.availHeight - height)/2;
  }
  popup = window.open( url, '_blank',
						'toolbar=no,scrollbars=no,location=no'+
						',statusbar=no,menubar=no,resizable=no'+
						',width=' + width + ',height=' + height +
						',left='+x+',top='+y );
  popup.focus();
}