Bake at 350 degrees!!!!!!!!!!!!1 My God thats HOT HOT HOT! Turn it down, Also get some new glass, At the back of the oven door their will be screws and a metal plate holding it in, Measure the glass and go to a glazier manufacturer and ask them to make you a new one.
Make sure you tell them what it is for!!!, they will point you in the right direction, Should only cost yuou around 25 quid at the most.
Most glass is able "but not all" to handle high temp's, to note = I am a Glazier by trade.
Best of luck.
Daz
July 2008