如何模拟移动浏览器的触摸事件?Android、iPhone ?

I am creating a web app. I was testing it on a mobile browser and noticed that :active pseudo class dsnt really work. How should I simulate clicks for mobile browser? I am using css sprites. I stumbled upon ontouchstart but dont know how to use that. can anyone help me over it? Thanks in advance.I am creating a web app. I was testing it on a