function lettersAndNumbersOnly(evt) {    
    evt = (evt) ? evt : event;
    var charCode = (evt.charCode) ? evt.charCode : ((evt.keyCode) ? evt.keyCode :
        ((evt.which) ? evt.which : 0));
        if (charCode == 8)    // back space
            return true;
        if (charCode == 37)    // <- arrow
            return true;
        if (charCode == 39)   /// -> arrow
            return true;
        if (charCode == 9)   /// -> tab
            return true;
        if ((charCode >= 45 && charCode <= 57) || // 0-9 and back slash(/ code 47) and dash(- code 45) and delete(code 46)
            (charCode >= 65 && charCode <= 90) || // A-Z
            (charCode >= 97 && charCode <= 122))  // a-z
            {
            return true;
        }
        else
            return false;
}

function lettersAndSpaceAndNumbersOnly(evt) {
    evt = (evt) ? evt : event;
    var charCode = (evt.charCode) ? evt.charCode : ((evt.keyCode) ? evt.keyCode :
        ((evt.which) ? evt.which : 0));
    if (charCode == 32)    // space
        return true;
    if (charCode == 8)    // back space
        return true;
    if (charCode == 37)    // <- arrow
        return true;
    if (charCode == 39)   /// -> arrow
        return true;
    if (charCode == 9)   /// -> TAB
        return true;
    if ((charCode >= 45 && charCode <= 57) || // 0-9 and back slash(/ code 47) and dash(- code 45) and delete(code 46)
        (charCode >= 65 && charCode <= 90) || // A-Z
        (charCode >= 97 && charCode <= 122))  // a-z
        {
        return true;
    }
    else
        return false;
}

function isNumberKey(evt)
{
    var charCode = (evt.which) ? evt.which : event.keyCode
    if (charCode > 31 && (charCode < 48 || charCode > 57))
        return false;

    return true;

    if (charCode == 9)
            return true;
}

function checkpass_special(val){

    val1 = val.substr(0,1);
    val2 = val.substr(7,1);
    l = val.length;
    flag = true;
    cnt_c = 0;
    cnt_n = 0;
    if(val1  == "@" || val1 == "!" || val1 == "<" || val1 == ">" || val1 == "*"   || val1 == "$"  || val1== "+"  || val1== "~"  )
    {
        flag = false;

    }
    if(val2  == "@" || val2 == "!" || val2 == "<" || val2 == ">" || val2 == "*"   || val2 == "$"  || val2== "+"  || val2== "~"  )
    {
        flag = false;

    }
    for(i=0;i<l;i++)
    {
        c = val.substr(i,1);
        //alert(c);
        if(c == "@" || c == "!" || c == "<" || c == ">" || c == "*"   || c == "$"  || c == "+"  || c== "~"  )
        {
            cnt_c++;
        }
    }
    for(i=0;i<l;i++)
    {
        c = val.substr(i,1);
        //alert(c);
        if(c == "0" || c == "1" || c == "2" || c == "3" || c == "4"   || c == "5"  || c == "6"  || c== "7"  || c == "8"  || c == "9"  )
        {
            cnt_n++;
        }
    }
    if(cnt_c == 0 || cnt_n == 0)
    {
        flag = false;
    }
    return flag;
}

function ValidateEmailaddress(){    
    var mailformat = /^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/;
    if (document.getElementById("emailid").value.length!=0)
    {
        if(document.getElementById("emailid").value.match(mailformat)){            
            return true;
        }
        else{
            alert("You have entered an invalid email address!");
            document.getElementById("emailid").value="";
            return false;
        }
    }
    else{
        alert("Please enter Email address!");       
        return false;
    }
}