fuehrer

Hi guys, i'm new to JS and need a little help on this issue of mine..... i'm trying to popup a confirm dialog box whenever i close my browser window,the problem is that i'm able to do this in IE but i'm having problems when i'm using firefox.i'm doing this …

i'm new to java and this is my first post and a silly one too plzz help me out under what context should these both be used and how is it internally expressed or used by the compiler