function go_to_step(e)
{
	for(i = 1;i < 4;i++)
	{
		try	{
			document.getElementById("step_content_" + i).className="step_content_hide";
			document.getElementById("button_step_" + i).className="step_off";
		}
		catch(err){}
	}
	
	try
	{
		document.getElementById("step_content_"+e).className="step_content_show";
		document.getElementById("button_step_"+e).className="step_on";
		document.getElementById("step").value = e;
	}
	catch(err){}
}