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function check_email(_email)
{
var letters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_0123456789 ";
var i = 0, j = 0;
var match = false;
if (_email.length == 0) {
return false;
}
for (i = 0; i < _email.length; i++)
{
match = false;
for (j = 0; j < letters.length; j++)
{
if (_email.charAt(i) == letters.charAt(j))
{
match = true;
break;
}
}
if (!match)
{
if (_email.charAt(i) == '.') {
match = true;
}
}
if(!match) {
break;
}
}
if (i >= _email.length) {
return false;
}
if (_email.charAt(i++) != '@') {
return false;
}
var dotpassed = false;
while (i < _email.length)
{
var match = false;
for (j = 0; j < letters.length; j++)
{
if (_email.charAt(i) == letters.charAt(j))
{
match = true;
break;
}
}
if (!match)
{
if (_email.charAt(i) == '.')
{
dotpassed = true;
match = true;
}
}
if (!match) return false;
i++;
}
if (dotpassed) return true;
return false;
}