// JavaScript Document
function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

var navArr = new Array('menu_digital', 'menu_kameras', 'menu_blitzlicht', 'menu_dauerlicht', 'menu_stative');
function showSub(nav, mainnav, imgsrc) {
	for(i=0;i<navArr.length;i++){
		var curr = navArr[i];
		if(curr != nav) {
			document.getElementById(curr).style.visibility = "hidden";
		}
	}
	if(document.getElementById(nav).style.visibility == "visible"){
		document.getElementById(nav).style.visibility = "hidden";
		//document.getElementById(mainnav).src = "images/"+imgsrc+".jpg";
	}else{
		document.getElementById(nav).style.visibility = "visible";
		//document.getElementById(mainnav).src = "images/"+imgsrc+"_over.jpg";
	}
}

//-----------------------------------------
var srollObject = null;
var showNav="no";
var gDivHeight;
var gShowHeight;

function initPage(divheight) {
	var objElement = document.getElementById('inhalt');
	srollObject = new scroll(objElement, divheight);
	gShowHeight = divheight;
}
function scroll(objElement, intHeight) {
  var self = this;
  this._y = 0;
  objElement.style.top  = "0px";
  
  if(objElement.offsetHeight>intHeight){
		showNav="yes";
		gDivHeight=objElement.offsetHeight;
	}else{
		showNav="no";
	}

  this.setPosition = function(intPos, y) {
    if (intPos > 0) intPos = 0;
    if ((intPos < intHeight - objElement.offsetHeight))
      intPos = intHeight - objElement.offsetHeight;
    this._y = intPos;
    objElement.style.top  = this._y +"px";
  };

  this.scrollY = function(y) { this.setPosition(this._y + y, y); };

  this.start = function(y) { 
    this.scrollTimer = window.setInterval(
      function() { self.scrollY(y); }, 25 );
  };
  this.stop = function() {
    if (this.scrollTimer) window.clearInterval(this.scrollTimer); };
};

function showNavi(){
	if(showNav=="yes"){
		document.getElementById("scrollnav").style.visibility = "visible";
	}else{
		document.getElementById("scrollnav").style.visibility = "hidden";
	}
}
//----------------------------------------wheel
 var stwheel=0;
function handle(delta) {
	if (delta < 0){
		if(stwheel>-gDivHeight+gShowHeight){
			stwheel=stwheel-14;
			document.getElementById('inhalt').style.top=stwheel+'px';
		}
	}else{
		if(stwheel<0){
			stwheel=stwheel+14;
			document.getElementById('inhalt').style.top=stwheel+'px';
		}
	}
	//alert(gDivHeight);
}


function wheel(event){
        var delta = 0;
        if (!event) /* For IE. */
                event = window.event;
        if (event.wheelDelta) { /* IE/Opera. */
                delta = event.wheelDelta/120;
                if (window.opera)
                        delta = -delta;
        } else if (event.detail) { 
                delta = -event.detail/3;
        }

        if (delta)
                handle(delta);

        if (event.preventDefault)
                event.preventDefault();
	event.returnValue = false;
}


if (window.addEventListener)
        /** DOMMouseScroll is for mozilla. */
        window.addEventListener('DOMMouseScroll', wheel, false);
/** IE/Opera. */
window.onmousewheel = document.onmousewheel = wheel;