Regarding the display of a dialog modal box in different versions of IE

Dear All,

I have developed a code in ABAP to display a dialog modal box. Its working fine in the IE7.0. But when i try to run the same code in IE6.0 the modal dialog box is not appearing properly.(i.e. with scroll bars and some external variations). Should i need to change the code to make it work fine in any version of IE. Pls help.