doubt about the navigation window

You cannot disable the "back" button using java. (other things you can do with java regarding back button: http://www.htmlgoodies.com/tutorials/buttons/article.php/3478911) You can use Asp: http://www.4guysfromrolla.com/webtech/111500-1.shtml Struts: http://marc.theaimsgroup.com/?l=struts-user&m=100281015318025&w=2 Keep in mind that diabling this feature is known as a bad programming tactic unless used in certian situations. People in general do not like when you take away their naviation buttons and this will detract from you site.