// JavaScript Document

/////////////////////////////////////////// Scroller functions ////////////////////////////////

function check_sroll() {
	
	var div = document.getElementById("inhalt");
	
	if(div != null) {
		
		var height = div.offsetHeight;
		var width = div.offsetWidth;
		var position = parseInt(width / 2);
		if(height > 244) {
			document.getElementById("scroll_up").style.visibility = "visible";
			document.getElementById("scroll_down").style.visibility = "visible";
			document.getElementById("scroll_up").style.marginLeft = position+"px";
			document.getElementById("scroll_down").style.marginLeft = position+"px";
		}	
		div.style.height = "244px";
	}
}
/** This is high-level function; REPLACE IT WITH YOUR CODE.
 * It must react to delta being more/less than zero.
 */
function check_slidersroll(anzahl) {

	for(x=1;x<=anzahl;x++) {
		
		var div = document.getElementById("inhalt_"+x);
		if(div != null) {
			
			var height = div.offsetHeight;
			var width = div.offsetWidth;
			var position = parseInt(width / 2);
			/*alert(height);*/
			if(height > 244) {
				document.getElementById("scroll_up_"+x).style.visibility = "visible";
				document.getElementById("scroll_down_"+x).style.visibility = "visible";
				document.getElementById("scroll_up_"+x).style.marginLeft = position+"px";
				document.getElementById("scroll_down_"+x).style.marginLeft = position+"px";
			}	
			div.style.height = "212px";
		}
	}
}
 
function handle(delta) {
	if (delta < 0)
	{
		  scroller2("dn");
	}
	else
	{
		scroller2("up");
	}
	
}

var hzuxbux = 1;
function scroller2(direction)
{
	if(direction == "dn")
	{
		document.getElementById("inhalt").scrollTop+=30;
	
	}
	else
	{
		document.getElementById("inhalt").scrollTop-=30;
	}
	if(hzuxbux < 3)
	{
		setTimeout("scroller2()", 10);
		hzuxbux++;
	}
}
function wheel(event){
	var delta = 0;
	if (!event) event = window.event;
	if (event.wheelDelta) {
		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;
}

/* Initialization code. */
if (window.addEventListener)
	window.addEventListener('DOMMouseScroll', wheel, false);
window.onmousewheel = document.onmousewheel = wheel;


/* scroll event content*/
var d=document;
var mode = "still";
var speed = 20; // in Millisekunden
var step_size = 4; // Schrittweite

function scroll( aNum) {
    
    // alert ("Ref= "+ref);
    switch(aNum) {
        case 1: // scroll up
            mode = "scroll_up";
            break;
            
        case -1: // scroll down
            mode = "scroll_down";
            break;
            
        case 0: // stop scrolling
            mode = "still";
            break;
    }
    do_scroll();
}

function do_scroll() {
    var ref = d.getElementById("inhalt");
    
    switch (mode) {
        case "still": // nothing
            break;
        
        case "scroll_up":
            ref.scrollTop-=step_size;
            window.setTimeout("do_scroll()", speed);
            break;
            
        case "scroll_down":
            ref.scrollTop+=step_size;
            window.setTimeout("do_scroll()", speed);
            break;
    }
}
function changeimg(img_name) {
	document.getElementById("rezeptimg").src = "images/small/"+img_name;	
}