var is_selected = 1;
function selectall(pattern,select){
	var R = new RegExp(pattern);
	var f = document.forms[0];
	var els=f.elements;
	var l = els.length;
	for (i=0;i<l;i++){
		if (els.item(i).name.match(R)!=null){
			els.item(i).checked=is_selected;
		}
	}
	if( is_selected == 1) is_selected = 0;
	else is_selected = 1; 
}