function emailCheck (emailStr) {

	var checkTLD=1;
	var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;
	var emailPat=/^(.+)@(.+)$/;
	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("Email address seems incorrect (check @ and .'s)");
		return false;
	}
	var user=matchArray[1];
	var domain=matchArray[2];
	for (i=0; i<user.length; i++) {
		if (user.charCodeAt(i)>127) {
			alert("Ths username contains invalid characters.");
			return false;
	   }
	}
	for (i=0; i<domain.length; i++) {
		if (domain.charCodeAt(i)>127) {
			alert("Ths domain name contains invalid characters.");
			return false;
	   }
	}

	if (user.match(userPat)==null) {
		alert("The username doesn't seem to be valid.");
		return false;
	}
	var IPArray=domain.match(ipDomainPat);
	if (IPArray!=null) {
		for (var i=1;i<=4;i++) {
			if (IPArray[i]>255) {
				alert("Destination IP address is invalid!");
				return false;
		   }
		}
		return true;
	}
	var atomPat=new RegExp("^" + atom + "$");
	var domArr=domain.split(".");
	var len=domArr.length;
	for (i=0;i<len;i++) {
	if (domArr[i].search(atomPat)==-1) {
	alert("The domain name does not seem to be valid.");
	return false;
	   }
	}
	if (checkTLD && domArr[domArr.length-1].length!=2 && domArr[domArr.length-1].search(knownDomsPat)==-1) {
		alert("The address must end in a well-known domain or two letter " + "country.");
		return false;
	}

	if (len<2) {
		alert("This address is missing a hostname!");
		return false;
	}
	return true;
}

function charactercheck(thecampo) {
	var iChars = "!@#$%^&*()+=-[]\\\';,./{}|\":<>?";

  for (var i = 0; i < thecampo.value.length; i++) {
  	if (iChars.indexOf(thecampo.value.charAt(i)) != -1) {
  		return false;
  	}
  }
}

function decimalcheck(thecampovalue) {
	var objRegExp  =  /(^-?\d\d*\.\d*$)|(^-?\d\d*$)|(^-?\.\d\d*$)/; 
  	//check for decimal point
 	return objRegExp.test(thecampovalue);

}

function digitcheck(thecampovalue) {
	inputStr = thecampovalue.toString();
	for (var i = 0; i < inputStr.length; i++) {
		var oneChar = inputStr.charAt(i)			
		if ((oneChar < "0" || oneChar > "9")&& oneChar != "/"){
			return false;
		}
	}
}

function currencycheck(thecampovalue) { 
	return RegExp(/^-?\$?[0-9\,]+(\.\d{2})?$/).test(String(thecampovalue).replace(/^\s+|\s+$/g, ""));
} 

function passwordcheck(thecampovalue) { 
	var anUpperCase = /[A-Z]/;
	var aLowerCase = /[a-z]/;
	var aNumber = /[0-9]/;
	if ((thecampovalue.search(aLowerCase) == -1) && (thecampovalue.search(aUpperCase) == -1)){
		alert("Invalid entry! At least must combination of one digit and character!");
		return false;
	} else {
		if(thecampovalue.search(aNumber) == -1){
			alert("Invalid entry! At least must combination of one digit and character!");
			return false;
		}
	}
}