function open_popup(url, window_name, options)
{
	window.open(url, window_name, options);
}

function returnObjById( id ) 
{ 
	if (document.getElementById) 
		var returnVar = document.getElementById(id); 
	else if (document.all) 
		var returnVar = document.all[id]; 
	else if (document.layers) 
		var returnVar = document.layers[id]; 
	return returnVar; 
}

var checkflag = 'false';
function checkAll(field)
{
	if (checkflag == 'false')
	{
		var elems = document.getElementsByName(field);
		for (i = 0; i < elems.length; i++)
		{
			elems[i].checked = true;
		}
		checkflag = 'true';
	}
	else {
		var elems = document.getElementsByName(field);
		for (i = 0; i < elems.length; i++)
		{
			elems[i].checked = false;
		}
		checkflag = "false";
	}
}

function checkBoxAll(field)
{
	var elems = document.getElementsByName(field);
	for (i = 0; i < elems.length; i++)
	{
		elems[i].checked = true;
	}
}

function uncheckBoxAll(field)
{
	var elems = document.getElementsByName(field);
	for (i = 0; i < elems.length; i++)
	{
		elems[i].checked = false;
	}
}