function clear_field( obj )
	{		
	obj.value = '';
	}

function doSectionAll (secNum, secName, secMax)
	{
	elmax = document.getElementById(secMax);	
	var max = elmax.value;
	
	//zwin wszystkie sekcje za wyjatkiem secNum
	for (i=0; i<max; i++)
		{
		var sec = secName+i;
		el = document.getElementById(sec);
		if (el && (sec!=secNum))		
			el.style.display="none";
		}
		
	el = document.getElementById(secNum);
	if (el.style.display=="none")
		{
		el.style.display=""
		}
	else
		{
		el.style.display="none"
		}
	}