function IsEmailValid(checkThisEmail) {

    var myEMailIsValid = true;
    var myAtSymbolAt = checkThisEmail.indexOf('@');
    var myLastDotAt = checkThisEmail.lastIndexOf('.');
    var mySpaceAt = checkThisEmail.indexOf(' ');
    var myLength = checkThisEmail.length;

if (myAtSymbolAt < 1 )
 {myEMailIsValid = false}

if (myLastDotAt < myAtSymbolAt)
 {myEMailIsValid = false}

if (myLength - myLastDotAt <= 2)
 {myEMailIsValid = false}

if (mySpaceAt != -1)
 {myEMailIsValid = false}

return (myLength?myEMailIsValid:false)
}

function hidden(n) {
if(document.getElementById('d'+n).className!="level1-ac")
  document.getElementById('d'+n).style.backgroundColor= "#ffffff";
}

function show(n) {
if(document.getElementById('d'+n).className!="level1-ac")
  document.getElementById('d'+n).style.backgroundColor= "#F8E7BC";
}

function hidden2(n) {
 if(document.getElementById('d'+n).className!="level1-ac")
   document.getElementById('d'+n).style.backgroundColor= "#ffffff";
}

function show2(n) {
if(document.getElementById('d'+n).className!="level1-ac")
  document.getElementById('d'+n).style.backgroundColor= "#FFF6E0";
}