email validation does not work

[zeroge]

Hi
I use the following form validation and it works all fine, except my email input does not get validated.

Input type = email
field name = emailto

this is the code:

function formCheck(formobj){
    // Enter name of mandatory fields
    var fieldRequired = Array("emailto","from", "emailfrom","zigi");
    // Enter field description to appear in the dialog box
    var fieldDescription = Array("Friends E-mail","Friends Name", "Your E-mail","Your Name");
    // dialog message
    var alertMsg = "These fields cannot be left blank:\n";

    var l_Msg = alertMsg.length;

    for (var i = 0; i < fieldRequired.length; i++){
        var obj = formobj.elements[fieldRequired[i]];
        if (obj){
            switch(obj.type){
            case "select-one":
                if (obj.selectedIndex == -1 || obj.options[obj.selectedIndex].text == ""){
                    alertMsg += " - " + fieldDescription[i] + "\n";
                }
                break;
            case "select-multiple":
                if (obj.selectedIndex == -1){
                    alertMsg += " - " + fieldDescription[i] + "\n";
                }
                break;
            case "text":
            case "textarea":
                if (obj.value == "" || obj.value == null){
                    alertMsg += " - " + fieldDescription[i] + "\n";
                }
                break;
            case "email":
                if (obj.value == "" || obj.value == null){
                    alertMsg += " - " + fieldDescription[i] + "\n";
                }
                var strValue = emailto.obj.value; 
                var strFilter = /^([0-9a-z]([-.\w]*[0-9a-z])*@(([0-9a-z])+([-\w]*[0-9a-z])*\.)+[a-z]{2,6})$/i;
                if (!strFilter.test(strValue))
                    alertMsg = "wrong or incomplete email" + fieldDescription[i] + "\n";
                }
                break;
            default:
            }
            if (obj.type == undefined){
                var blnchecked = false;
                for (var j = 0; j < obj.length; j++){
                    if (obj[j].checked){
                        blnchecked = true;
                    }
                }
                if (!blnchecked){
                    alertMsg += " - " + fieldDescription[i] + "\n";
                }
            }
        }
   }
    if (alertMsg.length == l_Msg){
        return true;
    }else{
        alert(alertMsg);
        return false;
    }
} 

What am I missing in the email validation, please?

and ... are there some samples available for other validations of this kind of form validation, e.g. only digits, no white spaces, etc...

Thank a 8M times