function select_all(frm){
	for (a=0; a<frm.length; a++)	{  
		if (frm.elements[a].type == "checkbox")
			frm.elements[a].checked = frm.sAll.checked;
	}
}

function marcar_sAll(frm)
{
	fx = 1
	fy = 0
	frm.sAll.checked = false;	
	for (a=0; a<frm.length; a++)  
		if (frm.elements[a].type == "checkbox"){
			fy +=1;
			if (frm.elements[a].checked == true) 
				fx += 1;
		}
	if (fx == fy)
		frm.sAll.checked = true;	
}



function createWindow(url, WinName, theWidth, theHeight){

	var winLeft = (screen.width - theWidth) / 2;

	var winTop = (screen.height - theHeight) / 2;

	window.open(url, WinName, 'titlebar.maximize=no, status=no, scrollbars=no, resizable=no, status=no, width=' + theWidth + ', height=' + theHeight + ', left=' + winLeft + ', top=' + winTop);

}