wcimo

I was driving home this morning and decided to roll down the windows since it was cool outside. When I got home, I realized that the front passenger window won't roll all the way up or down. I can pull the window up manually and tape it closed with packing tape but it won't hold up by itself. Does anyone have any suggestions on how to proceed? I was thinking of taking the door apart to see what is preventing it from going all the way down. Does anyone have the instruction on how to remove the door panel? Thanks for your assistance. I have attached a picture of the window at the where it rests.