function isDefined( val, defVal )
{
    if ( ( val + '' ) == 'undefined' )
    {
        return defVal;
    }
    else
    {
        return val;
    }
}

function getLocation( elem )
{
    var left = 0, top = 0;
    
    while( elem )
    {
        left += elem.offsetLeft;
        top += elem.offsetTop;
        elem = elem.offsetParent;
    }
    
    return new Point( left, top );
}

function Point( x, y )
{
    this.x = x;
    this.y = y;
}