Aligning an iframe page in the centre of dhtmlxwindow

A jsp page is posted in a iframe container inside a dhtmlx window. But the page gets butted at the left instead of uniform aligning. In iframe we have used align=“centre”, but still the page does not align to the centre. How can we align the page in the centre of dhtmlxwindow.

If you sure that the problem relates dhtmlxwindow, please provide the complete demo to recreate it. The demo should noy contain any server-side scripts.