Umrah visas are closed and shall not be issued before February 2010, anyways the procedure is as below;

Step One : Obtain a visit visa from Immigration Main Office. Please note must be a visit visa not Transit.
Step Two : Get the medical done at Medical commission Abu Hammour. Results may take upto three days.
Step Three : Collect Medical results and/or go directly for visa extenssion to immigration at Abu Hamour Behind Waqood Storage Tanks area.
Step Four : After the visa extenssion apply for return visa at the same counter in Immigration.

Youy are done. I did the same when my mother visited us Two months ago.

Have a nice trip to Umrah.