I turned on script debugger on my Windows PC and verified that CNN uses onMouseDown event. But I know that iPhone browser works fine on such sites because the web developers probably coded their site to handle that browser.

So my question is
How do I change user agent string for my N800/N810 browser (MicroB engine) to be same as iPhone browser to test this?

A lot more sites have probably been tested with iPhone browser and since it has touch scrolling, I am thinking that this might allow better touch-scrolling with MicroB.