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)
  var valtrave = false
  if (matchArray==null) {
 	 //alert("Check your E-mail Address, please !")
	 return valtrave
  }
  var user=matchArray[1]
  var domain=matchArray[2]
  if (user.match(userPat)==null) {
    //alert("Check your E-mail Address, please !")
     return valtrave
  }
  var IPArray=domain.match(ipDomainPat)
  if (IPArray!=null) {
	  for (var i=1;i<=4;i++) {
        if (IPArray[i]>255) {
		//alert("Check your E-mail Address, please !")
		return valtrave
	    }
      }
  }
  var domainArray=domain.match(domainPat)
  if (domainArray==null) {
	//alert("Check your E-mail Address, please !")
	return valtrave
  }
  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>3) {
    //alert("Check your E-mail Address, please !")
    return valtrave
  }
  if (len<2) {
    //var errStr="This address is missing a hostname!"
    //alert("Check your E-mail Address, please !")
    return valtrave
  }
    return true
}