function ShowDiv(a)
{
	document.getElementById('task1').style.display = 'none';
	document.getElementById('task2').style.display = 'none';
	document.getElementById('task3').style.display = 'none';
	document.getElementById(a).style.display = 'block';

	document.getElementById('task1a').className = 'tab1';
	document.getElementById('task2a').className = 'tab1';
	document.getElementById('task3a').className = 'tab1';
	document.getElementById(a + 'a').className = 'tab1_active';
}

function ShowHideDiv(a,b)
{
	document.getElementById(a).style.display = b;
}

function HideAllShowOneDiv(a,b,c)
{
	/*
	a - elotag
	b - hany van ebbol
	c - akit megjelenitunk
	*/
	for(var i=1;i<=b;i++)
	{
		document.getElementById(a + i).style.display = 'none';
		document.getElementById(a + i).className = 'tab1';
	}
	document.getElementById(c).style.display = 'display';
	document.getElementById(c).className = 'tab1_active';
}

function ShowAllDiv(a,b)
{
	document.getElementById(a).style.display = b;
}