Telerik java script resize problem

Question

I have an Telerik asp.net control that generate an html code that contains 2 div's, I resize this div's using js, after that this page is loading in iframe and my div's resize to default values, where is the problem??

the aspx page: http://www.filehosting.org/file/details/144561/example.aspx

js function to resize: ResizeDiv()

RAD_SPLITTER_PANE_CONTENT_RadpaneSliding and RAD_SPLITTER_PANE_CONTENT_RadPaneMain are my div's after control generates html markup