Urdu characters joining problem

I'm trying to write Urdu language characters in a div using javascript. The problem is that they dont change their shape when i write two characters that should have different shape when开发者_高级运维 written together. For example ﺝ and ا when written together should look as جا. They dont merge with each other. Similar is the problem with other characters. Please help!

I got the answer. Actually I was copying other characters that visually looked the same but where not the one I needed. For example, one character from urdu and other from arabic will not join properly. So whenever copying characters, even if they look same, do consider that they may have different unicodes for different languages.