BM_Y_DIFF = 1050;

BM_Y_TMP_DIFF = 1050;

BM_Y_LIMIT = 892; // valeur à changer (voir aussi calque)

BM_SPEED = 20;

BM_DECALAGE = 50; // valeur à changer (placement vertical)

BM_LAYER = "drag_remote";

BM_OBJ = document.getElementById(BM_LAYER);



function bodyMovinInit() {

    if (BM_OBJ != null) {

        bodyMovin();

    }

}



function bodyMovin() {

    if (window.XMLHttpRequest) {

        if(document.all){

            //IE7

            BM_Y_DIFF = document.documentElement.scrollTop;

        } else {

            //mozilla, safari, opera 9…etc

            BM_Y_DIFF = window.pageYOffset + BM_DECALAGE;

        }

    } else {

        // IE6, anciens navigateurs

        BM_Y_DIFF = document.body.scrollTop + BM_DECALAGE;

    }

    if (BM_Y_DIFF < BM_Y_LIMIT) {

        BM_Y_DIFF = BM_Y_LIMIT;

    } else {

        BM_Y_DIFF += BM_SPEED;

    }



    if (BM_Y_DIFF != BM_Y_TMP_DIFF) {

        BM_Y_DIFF = (.1 * (BM_Y_DIFF - BM_Y_TMP_DIFF)) + BM_Y_TMP_DIFF;

        BM_OBJ.style.top = BM_Y_DIFF + "px";

    }



    BM_Y_TMP_DIFF = BM_Y_DIFF;

    setTimeout('bodyMovin()', 10);

}



if (isNavigatorOk()) {

    bodyMovinInit();

}