function validation() {
        var errStr = "";
        var errId = "";
        
        
        if ( document.getElementById("txtName").value == "" ) { errStr += "\n - Fullname"; 
            if (errId=="") { errId = "txtName";} }
        if ( document.getElementById("txtAddress").value == "" ) { errStr += "\n - Address"; 
            if (errId=="") { errId = "txtAddress";} }
        if ( document.getElementById("txtPostal").value == "" ) { errStr += "\n - Postal Code"; 
            if (errId=="") { errId = "txtPostal";} }
        if ( document.getElementById("txtCountry").value == "" ) { errStr += "\n - Country"; 
            if (errId=="") { errId = "txtCountry";} }        
        if ( document.getElementById("txtEmail").value == "" ) { errStr += "\n - Email Address"; 
            if (errId=="") { errId = "txtEmail";} }
        if ( document.getElementById("txtEmail").value != "" && !(/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(document.getElementById("txtEmail").value)) ) { errStr += "\n - Email Address: Incorrect format";
            if (errId=="") { errId = "txtEmail";} }
            
                    
        if (errStr != "") {
            alert("Please complete the following field(s)\n" + errStr);
            document.getElementById(errId).focus();
            return false;
        }
    }