Menu in Dropmenu Menu

Menu in Dropdown Menu is on the right side. I'd like to change it to the left side:
current position - red color.
Website: http://www.furniturefinder.biz/furniture/

Can someone help me with this problem? Thanks in advance.

 

I see you figured that one out. So what did you end up doing?

 

Changed :
#mainMenu li li {
display:block; }
to:
#mainMenu li li {
display:block;
right:8em;
}