Easy to make, visitors do not have to download any font since urdu is in the form or image files, but takes time to download. If any mistake is made in the text have to write the whole thing again. Problems in designing the pages, not much you can do with the text once the image file is generated. 
Software : Inpage, Kaatib, Raakim or scanned images of handwritten text.
Ease of Use : Easy
Cost : Free to $300 depends on the software program.

Much more flexible since you can modify the text while making the web page, vistor has to download and install the font, font is not beautiufl nastaleeq but naskh, which is little difficult to read for Urdu people. 
Software : Parsnegar, Urdu Nigar, Devalipi Urdu
Ease of Use :  Moderate
Cost : Free to $95
How to do it? 

Nastaleeq font, the plug-in is self installed on the visitor's computer system, almost no time for pages to download and display.
Software:  Urdu 98
Ease of Use : difficult
Cost : $150-200
How to do it ?

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tips, tricks and resrources for the webmasters