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";

}



/**
@param string rowid the id o fthe row you want to make disappear
@param oject  opts  Effect options such as {duration:3}
*/
function fadeTableRow(rowid,opts){
    if(!opts){
        opts = {to:'0.6'};
    }
    var row  = $(rowid);
    var cells= row.childNodes;
    for(i=0;i<cells.length;i++){
        if(cells[i].tagName == 'TD'){
            new Effect.Fade(cells[i],opts);
        }
    }
    new Effect.Fade(row,opts);
}
/**
@param string rowid the id o fthe row you want to make disappear
@param oject  opts  Effect options such as {duration:3}
*/
function appearTableRow2(rowid,opts){
    if(!opts){
        opts = {from:'0.6'};
    }
    var row  = $(rowid);
    var cells= row.childNodes;
    for(i=0;i<cells.length;i++){
        if(cells[i].tagName == 'TD'){
            new Effect.Appear(cells[i],opts);
        }
    }
    new Effect.Appear(row,opts);
}