// JavaScript Document
function setOpacity(value) {
	document.getElementById("event_popup").style.opacity = value / 10;
	document.getElementById("event_popup").style.filter = 'alpha(opacity=' + value * 10 + ')';
}

function fadePopup() {
	for( var i = 0 ; i <= 100 ; i++ )
		setTimeout( 'setOpacity(' + (i / 10) + ')' , 8 * i );
}

function fadeOutPopup() {
	for( var i = 0 ; i <= 100 ; i++ ) {
		setTimeout( 'setOpacity(' + (10 - i / 10) + ')' , 8 * i );
	}

	setTimeout('hidePopup()', 800 );
}

function positionPopup() {
  var scrolledX, scrolledY;
  if( self.pageYOffset ) {
    scrolledX = self.pageXOffset;
    scrolledY = self.pageYOffset;
  } else if( document.documentElement && document.documentElement.scrollTop ) {
    scrolledX = document.documentElement.scrollLeft;
    scrolledY = document.documentElement.scrollTop;
  } else if( document.body ) {
    scrolledX = document.body.scrollLeft;
    scrolledY = document.body.scrollTop;
  }

  var centerX, centerY;
  if( self.innerHeight ) {
    centerX = self.innerWidth;
    centerY = self.innerHeight;
  } else if( document.documentElement && document.documentElement.clientHeight ) {
    centerX = document.documentElement.clientWidth;
    centerY = document.documentElement.clientHeight;
  } else if( document.body ) {
    centerX = document.body.clientWidth;
    centerY = document.body.clientHeight;
  }

  var leftOffset = scrolledX + (centerX - 810) / 2;
  var topOffset = scrolledY + (centerY - 420) / 2;

  document.getElementById("event_popup").style.top = topOffset + "px";
  document.getElementById("event_popup").style.left = leftOffset + "px";
}

function hidePopup() {
	document.getElementById("event_popup").style.display = "none"
	document.getElementById("holder").style.display = "none";
}

function showPopup() {
	setOpacity(0);
	document.getElementById("event_popup").style.display = "block";
	document.getElementById("holder").style.display = "block";
	fadePopup();
    positionPopup();
    document.body.onscroll = positionPopup;
	window.onscroll = positionPopup;
    window.setTimeout("fadeOutPopup()", 25000);
	
}

function callPopup(){
	window.setTimeout("showPopup()", 60000);
}