Javascript Events are not working in Tablet-pc?

I have developed a web application in 3.5. It is consuming lot of javascript/JQuery events and working properly in normal browser in pc, but my client is saying that these are not working in tablet-pc/android and IPad . Like I have a dropdownlist in which I am firing keypress and mouse click events in javascript, and these are perfectly working in normal browsers, I need to be in working form all these in IPads and android tablet-pcs.