// JScript File
function Validate_PhoneNumber(oSrc, args)
        {
            if(document.getElementById("ctl00_ContentPlaceHolder1_txtHomeNumber").value=="" && document.getElementById("ctl00_ContentPlaceHolder1_txtMobileNumber").value=="")
                args.IsValid=false;
            else
                args.IsValid=true;
        }
        
        function getKeyCode(e)
        {
            if (window.event)
               return window.event.keyCode;
            else if (e)
               return e.which;
            else
               return null;
        }

        function keyRestrict(e, validchars) 
        {
            var key='', keychar='';
            key = getKeyCode(e);
            
            if (key == null) 
                return true;
                
            keychar = String.fromCharCode(key);
            keychar = keychar.toLowerCase();
            validchars = validchars.toLowerCase();
            
            if (validchars.indexOf(keychar) != -1)
                return true;
                
            if ( key==null || key==0 || key==8 || key==9 || key==13 || key==27 )
                return true;
                
            return false;
        }