Passing Information between two asp.net pages with out server hits

Hi, I have an asp.net page which contains a dropdown list web control. From this asp.net page I am opening a new window thru javascript which is another asp.net page. There I perform some search and return the value to the opener. If I pass the value through javascript to my page, I can get the value in HTML textbox. but I cannot get the same in dropdown list. The value I am passing is one of the list items of dropdown list Can any one tell me how to select the particular value in the drop down list with out server hits. Please tell me the solution as soon as possible.