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I would like to have two different backrounds for a context menu. One background color for the left part (where the pictures are dispayed) and another backgroud color for the right part (where the text is displayed). I would like to do this programaticaly through javascript because this way I build my context menu.

Such feature is not available through API, but you can

a) Change appropriate settings for all menu items through dhtmlxMenu.css file

or

b) You can related HTML elements directly through DOM and change appropriate settings
            aMenuBar.getItem('main_file').CSSTag.style.backgroundColor='red';
            aMenuBar.getItem('main_file').imageTag.parentNode.style.backgroundColor='green';