function CheckedAll(formName)
{

var elements = document.forms[formName].elements;

if(typeof(document.forms[formName]) != 'undefined'){

	for(var i=0; i<elements.length; i++){

		if(elements[i].tagName == 'INPUT' && elements[i].type == 'checkbox' && elements[i].id == 'tread'){
			elements[i].checked = 1; 
         //elements[i].disabled = 1;
		}
	}// for
}// if

}


function UncheckedAll(formName)
{

if(typeof(document.forms[formName]) != 'undefined'){

	var elements = document.forms[formName].elements;

	for(var i=0; i<elements.length; i++){

		if(elements[i].tagName == 'INPUT' && elements[i].type == 'checkbox' && elements[i].id == 'tread'){
			elements[i].checked = 0; 
         //elements[i].disabled = 0;
		}
	}// for
}// if

}