function chksp(sp)
{
	var c, i;
	for (i=0; i < document.forms["lines"].elements.length; i++)
	{
		c = document.forms["lines"].elements[i];
		if (c.name=="s_"+sp) c.checked=true;
	}
}
function unchksp(sp)
{
	var c, i;
	for (i=0; i < document.forms["lines"].elements.length; i++)
	{
		c = document.forms["lines"].elements[i];
		if (c.name=="s_"+sp) c.checked=false;
	}
}
function chkspall()
{
	var c, i;
	for (i=0; i < document.forms["lines"].elements.length; i++)
	{
		c = document.forms["lines"].elements[i];		
		if (c.name.indexOf("s_")==0) c.checked=true;
	}
}
function unchkspall()
{
	var c, i;
	for (i=0; i < document.forms["lines"].elements.length; i++)
	{
		c = document.forms["lines"].elements[i];		
		if (c.name.indexOf("s_")==0) c.checked=false;
	}
}