function getChkEmail(obj) {
    var i;
    var j;
    var check=0;
    var hancheck=0;
    var dot=0;
    var before = "";
    var after = "";
    var beforedot = "";

    if(obj.value.length == 0){
        return;
    }
    obj.value = Rtrim(obj.value);
    obj.value = Ltrim(obj.value);

    for(i=0; i<obj.value.length; i++) {
        if(obj.value.charAt(i) == '@') { check = check + 1; }
        else if(check == 0) { before = before + obj.value.charAt(i); }
        else if(check == 1) { after = after + obj.value.charAt(i); }
    }

    for(j=0;j<after.length;j++){
        if(after.charAt(j)=='.'){hancheck = hancheck +1;}
        else if(hancheck==0){beforedot = beforedot + after.charAt(j);}
    }
    if( check >= 2 || check == 0 ) {
        return false;
    }

    for(i=0; i<before.length; i++) {
        if(!((before.charAt(i) >= 'A' && before.charAt(i) <= 'z') ||
            (before.charAt(i) >= '0' && before.charAt(i) <= '9') ||
            (before.charAt(i) == '_') || (before.charAt(i) == '.') ||
            (before.charAt(i) == '-'))) {
            return false;
        }
    }

    for(i=0; i<after.length; i++) {
        if(!((after.charAt(i) >= 'A' && after.charAt(i) <= 'z') ||
            (after.charAt(i) >= '0' && after.charAt(i) <= '9') ||
            (after.charAt(i) == '_') || (after.charAt(i) == '.') ||
            (after.charAt(i) == '-'))) {
            return false;
        }
    }

    for(i=0; i<after.length; i++) {
        if(after.charAt(i) == '.') {
            dot = dot + 1;
        }
    }

    if( dot < 1 ){
        return false;
    }
    return(true);
}

function Ltrim(strings){
    var retString = "";
    var c;
    var i;
    var end=0;
    for(i=0;i<strings.length;i++) {
        c = strings.charAt(i);
        if(c != ' ' || end==1){
           retString += c;
           end = 1;
        }
    }
    return(retString);
}

function Rtrim(strings){
    var retString = "";
    var c;
    var i;
    var end=0;
    for(i=strings.length - 1;i>=0;i--) {
        c = strings.charAt(i);
        if(c != ' ' || end==1){
           retString = c + retString;
           end = 1;
        }
    }
    return(retString);
}