ActionScript 3.0 :: How To Delete Loaded Bytes

so i have created a preloader to load pictures... and i created a button to stop the preloader if the user changed his mind and wanted to change the picturethe problem is that each time i click a picture and cancel it, the bytes remain in memory, so if I click on another picture very fast both the first picture's bytes and second picture's bytes get accumulated and load together, which means much much slower loadingso how can i delete the bytes loaded of the image if i click the cancel button?

ActionScript Code:
function onclsLdrclick(e:MouseEvent):void {
l.contentLoaderInfo.removeEventListener(Event.COMPLETE, onImgComp);

[code].....