function checkAll(form)
{
	for (i = 0; i < form.elements.length; i++)
	{
		
		if ( form.elements[i].type== "checkbox" ) form.elements[i].checked = true ;
	}
};
function uncheckAll(form)
{
	for (i = 0; i < form.elements.length; i++)
	{
		if ( form.elements[i].type== "checkbox" ) form.elements[i].checked = false ;
	}
};