function emailCheck (emailStr) {

var emailPat=/^(.+)@(.+)$/
var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]"
var validChars="\[^\\s" + specialChars + "\]"
var quotedUser="(\"[^\"]*\")"
var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/
var atom=validChars + '+'
var word="(" + atom + "|" + quotedUser + ")"
var userPat=new RegExp("^" + word + "(\\." + word + ")*$")
var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$")
var matchArray=emailStr.match(emailPat)
if (matchArray==null) {
	alert("Nem érvényes e-mail cím!")
	return false
}
var user=matchArray[1]
var domain=matchArray[2]
if (user.match(userPat)==null) {
    return false
}
var IPArray=domain.match(ipDomainPat)
if (IPArray!=null) {
    // this is an IP address
	  for (var i=1;i<=4;i++) {
	    if (IPArray[i]>255) {
		return false
	    }
    }
    return true
}

// Domain is symbolic name
var domainArray=domain.match(domainPat)
if (domainArray==null) {
    return false
}

/* domain name seems valid, but now make sure that it ends in a
   three-letter word (like com, edu, gov) or a two-letter word,
   representing country (uk, nl), and that there's a hostname preceding 
   the domain or country. */

/* Now we need to break up the domain to get a count of how many atoms
   it consists of. */
var atomPat=new RegExp(atom,"g")
var domArr=domain.match(atomPat)
var len=domArr.length
if (domArr[domArr.length-1].length<2 || 
    domArr[domArr.length-1].length>5) {
   // the address must end in a two letter or three letter word.
   return false
}

// Make sure there's a host name preceding the domain.
if (len<2) {
   alert(errStr)
   return false
}

// If we've gotten this far, everything's valid!
return true;
}

function showtab(tab, ful, sum)
	{
	var i;
	// osszes ful elrejtese
	for (i=0; i< sum;i++)
	{
		document.getElementById("tab_"+tab+"_"+i).className="tabbeddiv_hidden";
		document.getElementById("ful_"+tab+"_"+i).className="";
	}
		document.getElementById("tab_"+tab+"_"+ful).className="";
		document.getElementById("ful_"+tab+"_"+ful).className="selected";
}
function noop()
{
return true;
}