var downNLayerId;
var dropNDegree = 1; //½ºÅ©·Ñ ¼Óµµ
var doNDirect;
var DirectNTerm = 5000; //½ºÅ©·Ñ Áö¿¬½Ã°£
var curNDropIdx = 0;

function Directon(){
    dropNDegree = 0;
}

function Directoff(){
    dropNDegree = 1;
}

function DirectNDown()
{
        clearInterval(doNDirect);
        clearInterval(downNLayerId);

        for(i = curNDropIdx ;i < document.all["NDropHit"].length + curNDropIdx;i++){
                document.all["NDropHit"][i%document.all["NDropHit"].length].style.posTop = document.all["NDropHit"][i%document.all["NDropHit"].length].style.posHeight * (-1*((i-curNDropIdx)%document.all["NDropHit"].length));
        }
        var temp = 'setInterval("DownLayer()",20)';
        downNLayerId = eval(temp);
        direction = "down";
}
function DownLayer()
{
        if(document.all["NDropHit"][curNDropIdx].style.posTop < document.all["NDropHit"][curNDropIdx].style.posHeight){
                for(j = curNDropIdx ;j < document.all["NDropHit"].length + curNDropIdx;j++){
                        document.all["NDropHit"][j%document.all["NDropHit"].length].style.posTop += dropNDegree;
                }
        }else{
                clearInterval(downNLayerId);
                for(j = curNDropIdx ;j < document.all["NDropHit"].length + curNDropIdx;j++){
                        document.all["NDropHit"][j%document.all["NDropHit"].length].style.posTop = document.all["NDropHit"][j%document.all["NDropHit"].length].style.posHeight *((-1*((j-curNDropIdx)%document.all["NDropHit"].length))+1);
                }
                curNDropIdx = (curNDropIdx + 1) ;
                curNDropIdx = curNDropIdx > document.all["NDropHit"].length-1 ? curNDropIdx%document.all["NDropHit"].length:curNDropIdx;
                var temp = 'setInterval("DirectNDown()",DirectNTerm)';
                doNDirect = eval(temp);
        }
}

function DirectNUp()
{
        clearInterval(doNDirect);
        clearInterval(downNLayerId);
        var tempIdx = 0;
        for(i = 0;i<document.all["NDropHit"].length;i++){
                tempIdx = (document.all["NDropHit"].length + curNDropIdx - i) %document.all["NDropHit"].length;
                document.all["NDropHit"][tempIdx].style.posTop = i*document.all["NDropHit"][tempIdx].style.posHeight;
        }
        var temp = 'setInterval("UpLayer()",20)';
        downNLayerId = eval(temp);
        direction = "up";
}
function UpLayer()
{
        var tempIdx = 0;
        if(document.all["NDropHit"][curNDropIdx].style.posTop < document.all["NDropHit"][curNDropIdx].style.posHeight && document.all["NDropHit"][curNDropIdx].style.posTop > document.all["NDropHit"][curNDropIdx].style.posHeight * (-1)){
                for(j = 0 ;j < document.all["NDropHit"].length;j++){
                        tempIdx = (document.all["NDropHit"].length + curNDropIdx - j) %document.all["NDropHit"].length;
                        document.all["NDropHit"][tempIdx].style.posTop -= dropNDegree;
                }
        }else{
                clearInterval(downNLayerId);
                for(j = 0;j<document.all["NDropHit"].length;j++){
                        tempIdx = (document.all["NDropHit"].length + curNDropIdx - j) % document.all["NDropHit"].length;
                        document.all["NDropHit"][tempIdx].style.posTop = (j-1)*(document.all["NDropHit"][tempIdx].style.posHeight);
                }
                curNDropIdx = (curNDropIdx - 1) ;
                curNDropIdx = curNDropIdx < 0 ? document.all["NDropHit"].length-1:curNDropIdx;
                var temp = 'setInterval("DirectNUp()",DirectNTerm)';
                doNDirect = eval(temp);
        }
}