Hi,
So what can i do for problem of browsers ???
is there any another way to accomplish my desired task....
please reply as soon as possible...
Don't worry this problem has been around for nearly as long as the internet. It is a common dilemma for web designers.
If you cover IE6, IE7 & Firefox, are going to cover 85-90% of internet users (depending on whose figures you look at). In economics there is the law of diminishing marginal utility - in web design you will spend more time, effort and money disproportionately the more browsers you try and cover.
This where knowing your target audience is important. That's why they pay those marketing folk the big bucks. Here is one set of browser statistics:
Browser Statistics
Like I said earlier once you detect which browser, you can choose what do next, eg display a message or use a different template:
JavaScript Browser Detection
btw - div's and css in page formatting will generally get you closer to consistant formatting