jQuery.fn.center = function(horizontal, vertical, meParent) {
    return this.each(function() {
        var me = jQuery(this);
        if (meParent === undefined)
            meJParent = me.parent();
        else
            meJParent = jQuery(meParent);
        if (horizontal === undefined || horizontal != false)
            horizontal = true;
        if (vertical === undefined || vertical != false)
            vertical = true;

        var meOffset = me.offset();

        var newPosX = meOffset.left;
        var newPosY = meOffset.top;

        var deltaX = 0;
        var deltaY = 0;
        if (meParent != window) {
            var meParentOffset = meJParent.offset();
            deltaX = meParentOffset.left;
            deltaY = meParentOffset.top;
        }

        if (horizontal) {
            newPosX = Math.floor((meJParent.width() / 2) - (me.width() / 2)) + deltaX;
        }
        if (vertical) {
            newPosY = Math.floor((meJParent.height() / 2) - (me.height() / 2)) + deltaY;
        }

        me.css('position', 'absolute');
        me.offset({ left: newPosX, top: newPosY });
    });
};
jQuery.fn.wcenter = function(h, v) {
    return this.each(function() {
        var me = jQuery(this);
        me.center(h, v, window);
    });
};