Floating Menu

var target_x = 10;
var target_y = 10;

var has_inner = typeof(window.innerWidth) == 'number';
var has_element = document.documentElement && document.documentElement.clientWidth;

var fm_id='floatdiv';
var floating_menu = document.getElementById ? document.getElementById(fm_id) : document.all ? document.all[fm_id] : document.layers[fm_id];

var fm_shift_x, fm_shift_y, fm_next_x, fm_next_y;



//------------------FUNCTION START---------------------------
function move_menu()
{
alert('line 28');
    if (document.layers)
    {
alert('line 31');
        floating_menu.left = fm_next_x;
        floating_menu.top = fm_next_y;
    }
    else
alert('line 36');
    {
        floating_menu.style.left = fm_next_x + 'px';
        floating_menu.style.top = fm_next_y + 'px';
    }
}
//------------------FUNCTION END-----------------------------
//------------------FUNCTION START---------------------------

function compute_shifts()
{
alert('compute_shifts');
alert('line 43');
    fm_shift_x = has_inner ? pageXOffset : has_element ? document.documentElement.scrollLeft : document.body.scrollLeft;
    if (target_x < 0)
alert('line 46');
        fm_shift_x += has_inner ? window.innerWidth : has_element ? document.documentElement.clientWidth : document.body.clientWidth;
		fm_shift_y = has_inner ? pageYOffset : has_element ? document.documentElement.scrollTop : document.body.scrollTop;
    if (target_y < 0)
alert('line 50');
        fm_shift_y += has_inner ? window.innerHeight : has_element ? document.documentElement.clientHeight : document.body.clientHeight;
}

//------------------FUNCTION END-----------------------------
//------------------FUNCTION START---------------------------

function float_menu()
{
alert('float_menu');
    var step_x, step_y;
alert('line 61');

    compute_shifts();
alert('line 64');

    step_x = (fm_shift_x + target_x - fm_next_x) * .07;
    if (Math.abs(step_x) < .5)
        step_x = fm_shift_x + target_x - fm_next_x;
		step_y = (fm_shift_y + target_y - fm_next_y) * .07;
		
    if (Math.abs(step_y) < .5)
        step_y = fm_shift_y + target_y - fm_next_y;

    if (Math.abs(step_x) > 0 ||
        Math.abs(step_y) > 0)
    {
        fm_next_x += step_x;
        fm_next_y += step_y;
        move_menu();
    }

    setTimeout('float_menu()', 20);
}

alert('line 85');

compute_shifts();
if (document.layers)
{
    // Netscape 4 cannot perform init move
    // when the page loads.
alert('line 92');
    fm_next_x = 0;
    fm_next_y = 0;
}
else
{
alert('line 98');
    fm_next_x = fm_shift_x + target_x;
    fm_next_y = fm_shift_y + target_y;
    move_menu();
}

//float_menu();

window.onload = float_menu();