var aktiv;

function moveDIV( var1 )
{
	/* alter Wert ohne Einheit */
	var2 = document.getElementById("zeug").style.marginLeft;
	var2 = Number(var2.substring(0, var2.length-2));
			
	var3 = document.getElementById("zeug").style.width;
	var3 = Number(var3.substring(0, var3.length-2));
			
	var4 = document.getElementById("tool").style.width;
	var4 = Number(var4.substring(0, var4.length-2));
		
	if ( var1 == 0 )
	{
		document.getElementById("zeug").style.marginLeft = "0px";
			
	} else {
		// wenn links am rand angekommen
		if ( var2 + var1 <= 0 )
		{
			if ( var2 + var1 > -var3 + var4 )
			{
				document.getElementById("zeug").style.marginLeft = var2 + var1 + "px";
			} else {
					document.getElementById("zeug").style.marginLeft = -var3 + var4 + "px";
			}
		}
	}
}

function Start(pos) {	
	aktiv = window.setInterval("moveDIV(" + pos + ")", 15);
}

function Stop() {
	window.clearInterval(aktiv);
}

function wechsel(url,bildname) {
	window.document.images[bildname].src = url;
}