function CheckOne(index) {
  index = index*10 + 25;
  if ((document.MyForm.elements[index].checked==true) && (index>25)) {
    for(var i=1; i<=4; i++) {
      document.MyForm.elements[index-i].value = document.MyForm.elements[index-i-10].value;
    }
  }
}

function CheckOne(index) {
  index = index*11 + 26;
  if ((document.MyForm.elements[index].checked==true) && (index>26)) {
    for(var i=1; i<=4; i++) {
      document.MyForm.elements[index-i].value = document.MyForm.elements[index-i-11].value;
    }
  }
}

var rsSubmit = false;

function checkint(str)
{
    var n=0;
    for (var i = 0; i < str.length; i++) 
    {
        var ch = str.substring(i, i+1)
        if (ch < "0" || ch > "9")
        n++;
    }
    return(n);  
}

function checknum(str)
{
    var n=0;
    for (var i = 0; i < str.length; i++) 
    {
        var ch = str.substring(i, i+1)
        if ((ch < "0" || ch > "9") && ch!=".")
        n++;
    }
    return(n);  
}

function checkemail(str)
{
    var n=0;
    var p=0;
    var bl = 0;
    for (var i = 0; i < str.length; i++) 
    {
        var ch = str.substring(i, i+1)
	if ((p != 0) && (ch == '.'))
	    bl++;
	if (n != 0)
	    p++;
        if (ch == "@")
	    n++;
    }
    return(bl);  
}

function checkmsg(){
  if (rsSubmit==true) {
    alert ("You have been submited, please waiting...");
    return false;
  }
   if (document.MyForm.username.value==""){
      alert("Please enter your name! (length <100)!");
      document.MyForm.username.focus();
      return (false);
   }
   if (document.MyForm.useremail.value==""){
      alert("Please enter your E-mail!");
      document.MyForm.useremail.focus();
      return (false);
   }
   
if ((document.MyForm.useremail.value.indexOf("@") == -1)||(document.MyForm.useremail.value.indexOf(".")== -1)){
	  alert("Please enter a valid email address!\n");
	  document.MyForm.useremail.focus();
	  return (false);
}

   if (document.MyForm.message.value==""){
      alert("Please enter your comments about us! (length <500)!");
      document.MyForm.message.focus();
      return (false);
   }
   
  rsSubmit = true;
}