function load(location){
    if(document.images){
        var image = new Image();
        image.src = location;
        return image;
    }
}

function getElementPosition(oElement){
    var res = new Array(0, 0);
    do{
        res[0] += oElement.offsetLeft;
        res[1] += oElement.offsetTop;
    }while((oElement = oElement.offsetParent) != null);
    return res;
}

function positioningMenu(smNum, relateToParentX, relateToParentY, deltaX, deltaY){
    var menuId = "sub_menu_" + smNum;
    var menuObj = document.getElementById(menuId);
    
    var parentId = "j" + smNum;
    var parentObj = document.getElementById(parentId);
    var parentPosition = getElementPosition(parentObj);

    if(typeof(deltaX) == "undefined")
        deltaX = 0;
    if(relateToParentX == "right" || relateToParentX == "center"){
        parentWidth = parentObj.offsetWidth;
        if(relateToParentX == "center")
            parentWidth = parentWidth/2;
        deltaX += parentWidth;
    }
    
    if(typeof(deltaY) == "undefined")
        deltaY = 0;
    if(relateToParentY == "bottom" || relateToParentY == "center"){
        parentHeight = parentObj.offsetHeight;
        if(relateToParentY == "center")
            parentHeight = parentHeight/2;
        deltaY += parentHeight;
    }
    
    menuObj.style.left = parentPosition[0] + deltaX + "px";
    menuObj.style.top = parentPosition[1] + deltaY + "px";
}

var hTmMenuHide = null;
var hTmSubMenuHide = {"init":0};
var prevImgSrc = Array();
var openedMenusStack = Array();

function showMenu(smNum, parentNum, relateToParentX, relateToParentY, deltaX, deltaY, imgOver){
    clearTimeout(hTmMenuHide);
    clearTimeout(hTmSubMenuHide[smNum]);
    
    hideMenuById(parentNum, true, true);
    positioningMenu(smNum, relateToParentX, relateToParentY, deltaX, deltaY);
  
    if(document.images['main_menu_img_'+smNum]){
        prevImgSrc[smNum] = document.images['main_menu_img_'+smNum].src;
        document.images['main_menu_img_'+smNum].src = imgOver;
    }
    
    document.getElementById("sub_menu_" + smNum).style.display = 'block';
    openedMenusStack.push(smNum);
    
}

function hideMenu(smNum){
    var menuObj = document.getElementById("sub_menu_" + smNum);
    menuObj.style.display = 'none';
    images = document.getElementsByTagName("IMG");
    if(document.images && document.images['main_menu_img_'+smNum] && prevImgSrc[smNum] != null){
        document.images['main_menu_img_'+smNum].src = prevImgSrc[smNum];
    }
}

function hideMenuById(smNum, isIdParent, hideAllIfNotFound){
    if(smNum == 0){
        hideMenuAll();
    }else{
        var removeFromPos = -1;
        for(i = 0; i < openedMenusStack.length; i++){
            if(openedMenusStack[i] == 0)
                break;
            if(removeFromPos == -1 && openedMenusStack[i] == smNum){
                removeFromPos = i;
                if(isIdParent){
                    removeFromPos += 1;
                    continue;
                }
            }
            if(removeFromPos > -1){
                hideMenu(openedMenusStack[i]);
            }
        }
        if(hideAllIfNotFound && removeFromPos == -1){
            hideMenuAll();
        }else if(removeFromPos > -1 && removeFromPos < openedMenusStack.length){
            openedMenusStack.splice(removeFromPos, openedMenusStack.length-removeFromPos);
        }
    }
} 

function hideMenuAll(){
    for(i = 0; i < openedMenusStack.length; i++){
        hideMenu(openedMenusStack[i]);
    }
    openedMenusStack = new Array();
    
    // Switch to next block if you have some problems with div hiding caused special custom processing
    /*oDivs = document.getElementsByTagName("DIV");
    for(i = 0; i < oDivs.length; i++){
        if(oDivs[i].id.substr(0, 9) == "sub_menu_"){
            hideMenu(oDivs[i].id.substr(9));
        }
    }*/
} 

function hideMenuAllByTimeout(){
    hTmMenuHide = setTimeout('hideMenuAll()', 500);
}
function hideMenuIdByTimeout(smNum){
    hTmSubMenuHide[smNum] = setTimeout('hideMenuById('+smNum+', false, false)', 250);
}

/* HTML handlers */
function mon(smNum, smParentId){
    clearTimeout(hTmMenuHide);
    if(typeof(smNum) != "undefined" && smNum > 0){
        clearTimeout(hTmSubMenuHide[smNum]);
    }
    if(typeof(smParentId) != "undefined" && smParentId > 0){
        clearTimeout(hTmSubMenuHide[smParentId]);
    }
}
function moff(smNum){
    hideMenuAllByTimeout();
    if(typeof(smNum) != "undefined"){
        hideMenuIdByTimeout(smNum);
    }
}
function submoff(menuId){
    hideMenuIdByTimeout(menuId);
}
function ck(num,state){
}
function smclick(){
    hideMenuAll();
}