function validate_required(field,alerttxt)
{
with (field)
{
if (value==null||value=="")
  {document.getElementById('errormsg').innerHTML = alerttxt;return false;}
else {return true}
}
}

function validate_Int(field,alerttxt)
{
with (field)
{
if (isNaN(parseInt(value)))
  {document.getElementById('errormsg').innerHTML = alerttxt;return false;}
else {return true}
}
}

function validate_email(field,alerttxt)
{
with (field)
{
apos=value.indexOf("@");
dotpos=value.lastIndexOf(".");
if (apos<1||dotpos-apos<2) 
  {document.getElementById('errormsg').innerHTML = alerttxt;return false;}
else {return true;}
}
}

function validate_login(field,alerttxt)
{
with (field)
{
if (value==null||value=="")
  {document.getElementById('loginerror').innerHTML = alerttxt;return false;}
else {return true}
}
}