JQuery :: Set Relative Position For Dialog Box When Page Becomes Longer?

Have a web app which consists of a form and have it set up to launch a dialog box containing information next to the subject label text field.Everytime, someone fills out the form and clicks on submit, the form's message body (from the text area of the form) is displayed on top and theform is displayed underneath it. Before, I had it set up as fixed (x,y) for the dialog box to appear next to the subject label. But, now, whenthe page becomes longer, the dialog box doesn't appear next to my subject label text field. It is displayed a lot lower.

Here's the code to find the position:

// Finds the position and adds 40px to the left axis.
function findPosition(obj) {
var curleft = curtop = 0;
if (obj.offsetParent) {

[Code]....

How can I set it so my findPosition() calculation doesn't miscalculate when the page is too long (when scroll bars are needed)?

Is there a way to set the relative positioning to always have the dialog appear 40px right of the subject label?