Text Line Hight in Urdu in DW/CSS?

Hi everybody, this is a bit of a niche question I know but does anybody know if it is possible to set the line hight of Urdu text closer together than the default when a line of text does not have any tall letters in it? If you have a line of text which does not have any tall letters in, like the second line in the example below, this would reduce the space above it and make it to go closer to the line of text above it.

According to sources I have found online when you set the leading, the distance in height between lines of text, in css, negative values are not allowed. Does that mean there is no way of getting rid of the space above a line of text that has no tall letters in it! It just looks a bit weird when there is only two lines and one of them does not have any tall letters in it! Thanks for your help. http://www.maximum-robot.co.uk/leading-3.html