Roll Over Problem

programming flash
1

I am loading products from XML

in Roll Over ,A movie clip appears
I m trying to display Description , Price & Link in a MovieClip

when I move to that movieClip , as it moves away from image(on which roll-over was trigrred ) my description movieClip gone

function overImg(event:MouseEvent):void{

var tooltip:toolTip = new toolTip();
addChild(tooltip);

}

function outImg(event:MouseEvent):void{
removeChild(tooltip);
}

I have to add this ToolTip/ description box over the Image , and want to remove on roll-out