function checksignup() {

if(!isEmail(document.chkform.email.value,1)) 
{
 document.chkform.email.focus();
 return false;
}

if(!isvar(document.chkform.pwd.value,4,20,1,"User's PassWord Please input again!")) 
 {
 document.chkform.pwd.focus();
 return false;
 }
return true;
}

function isvar(s,min,max,n,text) 
{ 
if (n==1){
 if (s.length <min) { 
    window.alert(text); 
    return false; 
   } 
}
if (s.length > max) { 
 window.alert(text); 
 return false; 
} 
return true; 
} 
function isEmail (s,n) 
{ 
if (n==1){
  if (s.length < 1) { 
  window.alert("User's e-mail Please input again!"); 
  return false; 
  } 
var regu = "^(([0-9a-zA-Z]+)|([0-9a-zA-Z]+[_.0-9a-zA-Z-]*[0-9a-zA-Z]+))@([a-zA-Z0-9-]+[.])+([a-zA-Z]{2}|net|com|gov|mil|org|edu|int)$" 
var re = new RegExp(regu); 
if (s.search(re) != -1) { 
return true; 
} 
else 
{ 
window.alert ("Please enter a valid E-mail Address!") 
return false; 
} 
}
}