Effect.Center = function(element) {
    try {
        element = $(element);
    }
    catch(e) {
        return;
    }
    var my_width  = 0;
    var my_height = 0;
    if ( typeof( window.innerWidth ) == 'number' ) {
        my_width  = window.innerWidth;
        my_height = window.innerHeight;
    } else 
      if ( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
        my_width  = document.documentElement.clientWidth;
        my_height = document.documentElement.clientHeight;
    } else 
      if ( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
        my_width  = document.body.clientWidth;
        my_height = document.body.clientHeight;
    }
    element.style.position = 'absolute';
    element.style.display  = 'block';
    element.style.zIndex   = 99;
    var scrollY = 0;
    if ( document.documentElement && document.documentElement.scrollTop ) {
        scrollY = document.documentElement.scrollTop;
    } else 
      if ( document.body && document.body.scrollTop ) {
          scrollY = document.body.scrollTop;
      } else 
        if ( window.pageYOffset ) {
            scrollY = window.pageYOffset;
        } else 
          if ( window.scrollY ) {
            scrollY = window.scrollY;
          }
    var elementDimensions = Element.getDimensions(element);
    var setX = ( my_width  - elementDimensions.width  ) / 2;
    var setY = ( my_height - elementDimensions.height ) / 2 + scrollY;
    setX = ( setX < 0 ) ? 0 : setX;
    setY = ( setY < 0 ) ? 0 : setY;
    element.style.left = setX + "px";
    element.style.top  = setY + "px";
}