function isChecked(curCheckbox, required, message){
	
	oneChecked = false;
	if(required){
		for(i=0; i < curCheckbox.length; i++){
			if(curCheckbox[i].checked == true){
				oneChecked = true;
			}
		}
	}else{
		oneChecked = true;
	}
	if(oneChecked){
		return true;
	}else{
		curCheckbox[0].focus();	
		alert(message);
		return false;
	}
}