var bypixels;

var n = navigator.userAgent;
if(/Opera/.test(n)) bypixels = 2;
else if(/Firefox/.test(n)) bypixels = 3;
else if(/MSIE/.test(n)) bypixels = 2;

function dnm_vm_init(m,i,uid, level, parent) {
	var oh;
	uid = uid + i;
	m.Item[i]=new dnm_vm_submenu();
	m.Item[i].Title=dnm_vm_returnObjById(uid + 't');
	m.Item[i].SubMenu=dnm_vm_returnObjById(uid + 'c');
	m.Item[i].Arrow=dnm_vm_returnObjById(uid + 'i');
	if (/MSIE/.test(n)) {
	    //IE sometimes has a bug with offsetHeight - this is a workaround
	    oh=m.Item[i].SubMenu.lastChild.offsetHeight + m.Item[i].SubMenu.lastChild.offsetTop - m.Item[i].SubMenu.offsetTop;
	}
	else {
	    oh=m.Item[i].SubMenu.offsetHeight;
	}
	m.Item[i].Height=oh;
	m.Item[i].SubMenu.style.height=oh+'px';
	m.Item[i].Level=level;
	m.Item[i].Parent=parent;
	m.Item[i].IsOpen=true;
}

function dnm_vm_go(tid,sm) {
    var m = dnm_vm_getmenuindex(tid);
    if(dnm_vm[m].Item[sm].IsOpen == true) {
        dnm_vm_hide(m,sm);
    } else {
        if (dnm_vm[m].Item[sm].Level == 0)
            dnm_vm[m].Item[sm].Title.className = dnm_vm[m].TitleTopClassName;
        else if (dnm_vm[m].Item[sm].LevelTitleClassName)
            dnm_vm[m].Item[sm].Title.className = dnm_vm[m].TitleClassName + "_L" + dnm_vm[m].Item[sm].Level;
        else
            dnm_vm[m].Item[sm].Title.className = dnm_vm[m].TitleClassName;
        dnm_vm_show(m,sm);
    }
}

function dnm_vm_hide(m,sm) {
    var nr = dnm_vm[m].Item[sm].SubMenu.getElementsByTagName("a").length*bypixels;
    dnm_vm[m].Item[sm].SubMenu.style.height = (parseInt(dnm_vm[m].Item[sm].SubMenu.style.height)-nr)+"px";
    if (dnm_vm[m].Item[sm].Parent != -1) { dnm_vm_scrollparent(m,dnm_vm[m].Item[sm].Parent,nr*-1) }
    if(parseInt(dnm_vm[m].Item[sm].SubMenu.style.height) <= nr) {
        dnm_vm[m].Item[sm].SubMenu.style.display = "none";
        dnm_vm[m].Item[sm].SubMenu.style.height = "0px";
        dnm_vm[m].Item[sm].Arrow.src = dnm_vm[m].CollapsedIconUrl;
        dnm_vm[m].Item[sm].Title.className = dnm_vm[m].TitleHiddenClassName;
        dnm_vm[m].Item[sm].IsOpen = false;
        
        //arrange parents
        if (dnm_vm[m].Item[sm].Parent != -1) {
            dnm_vm_updateparentheight(m,dnm_vm[m].Item[sm].Parent,(parseInt(dnm_vm[m].Item[sm].Height))*-1); 
        }
    }
    else {
        setTimeout("dnm_vm_hide("+m+","+sm+")", 30);
    }
}

function dnm_vm_show(m,sm) {
    var nr = dnm_vm[m].Item[sm].SubMenu.getElementsByTagName("a").length*bypixels;
    dnm_vm[m].Item[sm].SubMenu.style.display = "";
    dnm_vm[m].Item[sm].SubMenu.style.height = (parseInt(dnm_vm[m].Item[sm].SubMenu.style.height)+nr)+"px";
    if (dnm_vm[m].Item[sm].Parent != -1) { dnm_vm_scrollparent(m,dnm_vm[m].Item[sm].Parent,nr) }
    if(parseInt(dnm_vm[m].Item[sm].SubMenu.style.height) > (parseInt(dnm_vm[m].Item[sm].Height)-nr)) {
        dnm_vm[m].Item[sm].SubMenu.style.height = dnm_vm[m].Item[sm].Height+"px";
        dnm_vm[m].Item[sm].Arrow.src = dnm_vm[m].ExpandedIconUrl;
        dnm_vm[m].Item[sm].IsOpen = true;
        
        //arrange parents
        if (dnm_vm[m].Item[sm].Parent != -1) {
            dnm_vm_updateparentheight(m,dnm_vm[m].Item[sm].Parent,parseInt(dnm_vm[m].Item[sm].Height)); 
        }
    }
    else {
        setTimeout("dnm_vm_show("+m+","+sm+")", 30);
    }
}

function dnm_vm_updateparentheight(m,sm,h) {
    if (h<0) h--; else h++;
    dnm_vm[m].Item[sm].Height = parseInt(dnm_vm[m].Item[sm].Height) + h;
    dnm_vm[m].Item[sm].SubMenu.style.height = parseInt(dnm_vm[m].Item[sm].Height) + "px";
    //arrange parents
    if (dnm_vm[m].Item[sm].Parent != -1) {
        dnm_vm_updateparentheight(m,dnm_vm[m].Item[sm].Parent,h); 
    }
}

function dnm_vm_scrollparent(m,sm,nr) {
    dnm_vm[m].Item[sm].SubMenu.style.height = (parseInt(dnm_vm[m].Item[sm].SubMenu.style.height)+nr)+"px";
    if (dnm_vm[m].Item[sm].Parent != -1) { dnm_vm_scrollparent(m,dnm_vm[m].Item[sm].Parent,nr) }
}

function dnm_vm_windowonload(f) {
    var prev=window.onload;
    window.onload=function(){ if(prev)prev(); f(); }
}

function dnm_vm_windowonunload(f) {
    var prev=window.onunload;
    window.onunload=function(){ if(prev)prev(); f(); }
}

function dnm_vm_putcookie(m,value,expiredays) {
    var c_name = "dnm_vm_menu" + m.ModuleID;
    var exdate=new Date();
    exdate.setDate(exdate.getDate()+expiredays);
    document.cookie = c_name + "=" + escape(value)
                      + ( (expiredays==null) ? "" : ";expires="+exdate )
                      + ";path=/" ;
}

function dnm_vm_store( tid ) {
    var m = dnm_vm_getmenuindex(tid);
    var hidden = new Array();
    
    for(var i in dnm_vm[m].Item) {
        if(dnm_vm[m].Item[i].Title.className == dnm_vm[m].TitleHiddenClassName) {
            hidden.push(i);
        }
    }

    //alert(hidden.join(","));
    dnm_vm_putcookie(dnm_vm[m], hidden.join(","), 30);
}

function dnm_vm_getcookie( m ) {
    var c_name = "dnm_vm_menu" + m.ModuleID;
    if(document.cookie.length > 0) {
        var c_start = document.cookie.indexOf(c_name + "=");
        if(c_start != -1) {
            c_start = c_start + c_name.length + 1;
            var c_end = document.cookie.indexOf(";",c_start);
            if(c_end == -1)
                c_end = document.cookie.length;
            return unescape(document.cookie.substring(c_start, c_end));
        }
    }
    return null;
}

function dnm_vm_IsNumeric(sText) {
   var ValidChars = "0123456789";
   var IsNumber=true;
   var Char;
 
   for (i = 0; i < sText.length && IsNumber == true; i++) { 
      Char = sText.charAt(i); 
      if (ValidChars.indexOf(Char) == -1) {
         IsNumber = false;
      }
   }
   return IsNumber;
}

function dnm_vm_restore( m ) {
    var x = dnm_vm_getcookie(m);
    if(x != null && x != "") {
        var hidden = x.split(",");        
        for(var i = 0; i<hidden.length; i++) {
            if (dnm_vm_IsNumeric(hidden[i]) && hidden[i] < m.Item.length)
            {
                m.Item[hidden[i]].SubMenu.style.display = "none";
                m.Item[hidden[i]].SubMenu.style.height = "0px";
                //m.Item[hidden[i]].Arrow.src = m.CollapsedIconUrl;
                m.Item[hidden[i]].Title.className = m.TitleHiddenClassName;
                m.Item[hidden[i]].IsOpen = false;

                //arrange parents
                if (m.Item[hidden[i]].Parent != -1) {
                    var midx = dnm_vm_getmenuindex(m.TabModuleID);
                    dnm_vm_updateparentheight(midx,m.Item[hidden[i]].Parent,(parseInt(m.Item[hidden[i]].Height))*-1); 
                } //if
            } //if
        } //for
    } //if
} //function

function dnm_vm_collapse( tid ) {
    var m = dnm_vm_getmenuindex(tid);
    for(var i = 0; i<dnm_vm[m].Item.length; i++) {
        dnm_vm[m].Item[i].SubMenu.style.display = "none";
        dnm_vm[m].Item[i].SubMenu.style.height = "0px";
        //dnm_vm[m].Item[i].Arrow.src = dnm_vm[m].CollapsedIconUrl;
        dnm_vm[m].Item[i].Title.className = dnm_vm[m].TitleHiddenClassName;
        dnm_vm[m].Item[i].IsOpen = false;

        //arrange parents
        if (dnm_vm[m].Item[i].Parent != -1) {
            var midx = dnm_vm_getmenuindex(dnm_vm[m].TabModuleID);
            dnm_vm_updateparentheight(midx,dnm_vm[m].Item[i].Parent,(parseInt(dnm_vm[m].Item[i].Height))*-1); 
        } //if
    } //for
} //function

function dnm_vm_returnObjById( id ) 
{ 
    if (document.getElementById) 
        var returnVar = document.getElementById(id); 
    else if (document.all) 
        var returnVar = document.all[id]; 
    else if (document.layers) 
        var returnVar = document.layers[id]; 
    return returnVar; 
} 

//Menu Class Definition
function dnm_vm_submenu() {
    this.Title;
    this.SubMenu;
    this.Arrow;
    this.Height;
    this.Level;
    this.Parent;
    this.IsOpen;
    this.SiblingsCount; //submenus and A tags. Due to IE bug Height will be calculated by calculating all siblings height
}

function dnm_vm_menu() {
    this.ModuleID;
    this.TabModuleID;
    this.Item;
    this.TitleTopClassName;
    this.TitleClassName;
    this.LevelTitleClassName;
    this.TitleHiddenClassName;
    this.ExpandedIconUrl;
    this.CollapsedIconUrl;
}

//Get menu index from TabModuleId
function dnm_vm_getmenuindex( tid ) {
    var iCtr = -1;
    
    do {
        iCtr++;
    }
    while (dnm_vm[iCtr].TabModuleID != tid)
    
    return iCtr;
}

//Line Menus
var dnm_vm = new Array();
var dnm_vm_ctr = 0;