var getal = 0;
function slide(start, eind, width, speed)
{
	// left » right
	if(start <= eind)
	{
		// Snelheid berekenen
		for(i = 0;i < speed;i++)
		{
			getal++;
		}
		var pos = start + getal;
		if(pos >= eind)
		{
			document.getElementById('slide_div').style.left = eind + 'px';
		} else
		{
			document.getElementById('slide_div').style.left = pos + 'px';
		}
	} else
	{ // right » left
		for(i = 0;i < speed;i++)
		{
			getal--;
		}
		var pos = start + getal
		if(eind > pos)
		{
			document.getElementById('slide_div').style.left = eind + 'px';
		} else
		{
			document.getElementById('slide_div').style.left = pos + 'px';
		}
	}
	// De div slide verplaatsen
	document.getElementById('slide_div').style.display = 'block';
	document.getElementById('slide_div').style.width = width + 'px';
}