dns entries for url resolution

We configured our website on IIS 5.0 with a virtual url address eportal.abc.us which is load balanced with
two servers (pdx1 and pdx2). When we enter eportal.abc.us it goes directly to http://pdx1.abc.com/irj. We want users to display only the global url on address bar (ie. eportal.abc.us). Even after entering IP/Hostname on both pdx1 & pdx2 on C:\WINNT\System32\Drivrers\etc (filename: hosts), it still goes directly to http://pdx1.abc.com/ir
Our IIS has a default.asp, which redirects the page to /ir

Any ideas? We do not want users to bookmark the page and continuously going to pdx1, as this defeats our load balancing solution. We do not want users to know which server they are logging into. Should I create another virtual website on IIS called eportal

Thanks
ajlore