Cross Domain Autofill And Submit

Im trying to make a "Search Many Sites from One Location". Heres my problem:

I have a form on my page which allows the user to enter
a search term and select which site he would like the results from.

(the sites dont allow URL pasting) the sites are library catalogues.

heres my idea, can this be done?:
User enters search term, selects site they want results from and
enters submit.

This takes user to a framed page with frame1 being library catalogue.
now either the frameset or frame 2 does this at timed interval gets the variable that was submited from search term entered and uses something like this bookmarklet

javascript:function ROIoiW(){var
i=0,j,A='anonymous',D,E,F=document.forms;while(i<F.length){E=F[i].elements;for(j=0;j<E.length;j++){D=E[j];if(D.type=='text'){D.value=(D.name.toUpperCase(). indexOf('MAIL')!=-1)?A+'@example.com':A}}i++}}ROIoiW();void(null)

and something to fill in the search term and press submit in frame1.