Variable decleration and URL retreval

I’m trying to load an external SWF into an MC. The SWF that loads is determined by a variable in the main MC. The first frame of my main MC contains a preloader, in the second I have added the following line of actionscript code declaring the variable;
[COLOR=#FF0000]var dealershipName = “bellville”;[/COLOR]

From the main menu a seporate MC is loaded onto level 1, from within this MC depending on the var declared in my main MC the external SWF is loaded into an MC called staff. The actionscript code used for this is as follows;

[COLOR=#FF0000]loadMovie(“http://www.baronsbellville.starterweb.co.za/staff/"+_root.dealershipName+"/nvss.swf”, this.staff);[/COLOR]

To the best of my limited knowledge at runtime the [COLOR=#FF9900]"+_root.dealershipName+"[/COLOR] should be replaced with [COLOR=#33CCCC][COLOR=#FF9900]bellville[/COLOR] [/COLOR]and the file should load. This is not the case though. If I replace the “+_root.dealershipName+” with bellville in the above url it works fine.

For some reason the var is not being passed from the root to the URL!!!

Any help will be greatly appreciated.

Thanks in advance.