function loading() {
	$('#loading').fadeIn();
}

String.prototype.trim = function() {
	return this.replace(/^\s+|\s+$/g,"");
}

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) {
        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) {
          for (var i=1;i<=4;i++) {
            if (IPArray[i]>255) {
                return false
            }
        }
        return true
    }

    var domainArray=domain.match(domainPat)
    if (domainArray==null) {
        return false
    }

    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>4) {
       return false
    }

    if (len<2) {
       return false
    }

    return true;

} 

function isEmail(email) {
	
	return email.match(/^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,6}$/i);
	
}