OR condition in a custom view

Here's a good one: in trying to create an "OR" condition in a custom folder view I seeme to have caused a Java error that won'nt let me seem the drop down box to change it.

Basically I was trying to create a view showing only *.drw OR *.dwg files and I putfilename EQUALS *.drw;*.dwg

Apparently that's not correct syntax..:-)

2 questions: how do I fix this error and how do I create an OR conditon in a search or view?