function checkbox_click_all(main_id, state) 
{
	var arr = document.getElementById(main_id).getElementsByTagName("input");
	/*
	if(state = 1)
		chk = true;
	else chk = '';
	*/
	chk = state;
	for (i=0;i<arr.length;i++)
		arr[i].checked = chk;
}

function open_window(link,w,h) 
{
	var win = 'width='+w+'px,height='+h+'px,menubar=no,location=no,resizable=yes,scrollbars=yes';
	newWin = window.open(link,'newWin',win);
	newWin.focus();
}

function hide_selects(main_id) 
{
	var arr = document.getElementById(main_id).getElementsByTagName("select");
	for (i=0;i<arr.length;i++)
		arr[i].style.visibility = 'hidden';
}

function show_selects(main_id) 
{
	var arr = document.getElementById(main_id).getElementsByTagName("select");
	for (i=0;i<arr.length;i++)
		arr[i].style.visibility = 'visible';
}