var left_border = -510
var right_border = 75;
var dx = 10;
var spd = 1;
var ptr = left_border;
conda = 'ptr < right_border';
condb = 'ptr > left_border';
var a=1;

var condition = conda;

function slide()
{
	ptr += dx;
	if (document.all)
	{
		document.all.slideBar.style.pixelLeft = ptr;
	}
	else if (document.layers)
	{
		document.slideBar.left = ptr;
	}
	else if (document.getElementById)
	{
		document.getElementById('slideBar').style.left = ptr + 'px';

	}
  
	if (eval(condition))
		setTimeout('slide()', spd);
	else
	{
		dx*=-1;
		if (a==1)
		{
			changeImage('arrow','helper','help_off');
			condition=condb;
			a=2;
		}
		else
		{
			changeImage('arrow','helper','help_on');
			condition=conda;
			a=1
		}
	}
}