function aridim() {
}
function ridim() {
    dimDx = getElementDimensions("dx");
    dimSx = getElementDimensions("sidebar");
    dimCon = getElementDimensions("bordo");
    dimFin = getViewportDimensions();
    if(dimSx.h>dimDx.h) {
        d = new MochiKit.Style.Dimensions(dimDx.w,dimSx.h)
        setElementDimensions('dx',d);
        d = new MochiKit.Style.Dimensions(dimCon.w,dimSx.h)
        setElementDimensions('bordo',d);
    }
}