function xmlhttp_szabadindex()
{
	var i, index = -1;
	
	for(i = 0 ; i < xmlhttp_tomb.length ; i++ )
	{
		if((xmlhttp_tomb[i].readyState == 0 || xmlhttp_tomb[i].readyState == 4) && xmlhttp_leker_folyamatban[i] == 0 && xmlhttp_nyit_folyamatban[i] == 0)
		{
			index = i;
			break;
		}
	}
	return index;
}