function check(theForm)
{
   if(theForm.userID.value== "")        
   {
   		alert("Enter a valid User ID");
   		theForm.userID.focus();
   		return false;
   }
   else
   { 
	user = theForm.userID.value;
	for (i=0; i<user.length; i++) {
	if ( (user.charCodeAt(i)>=48 && user.charCodeAt(i)<= 57 )||(user.charCodeAt(i)>=65 && user.charCodeAt(i)<=90 ) || (user.charCodeAt(i)>=97 && user.charCodeAt(i) <= 122 ) ) 
		{	if((i == 0) && (user.charCodeAt(i)>=48 && user.charCodeAt(i)<= 57))	
				{alert("First Character must Alphabet");
				theForm.userID.focus();
				return false;}
		}
	 	else
		{	
			alert("Ths username contains invalid characters.");
			theForm.userID.focus();
			return false;
 		} 
		} // FOR LOOP
   }
   if(theForm.pwd.value == "")
   {
   alert("Enter Password ");
   theForm.pwd.focus();
   return false;
   }
   else
	{ 
		password = theForm.pwd.value;
		for (i=0; i<password.length; i++) {
		if ( (password.charCodeAt(i)>=48 && password.charCodeAt(i)<= 57 )||(password.charCodeAt(i)>=65 && password.charCodeAt(i)<=90 ) || (password.charCodeAt(i)>=97 && password.charCodeAt(i) <= 122 ) ) 
		{	if((i == 0) && (password.charCodeAt(i)>=48 && password.charCodeAt(i)<= 57))	
				{alert("First Character must Alphabet");
				theForm.pwd.focus();
				return false;}
		}
	 	else
		{	
			alert("Ths Password field contains invalid characters.");
			theForm.pwd.focus();
			return false;
 		} 
		} // FOR LOOP
	}
   if(theForm.confirmPwd.value == "")
   {
   alert("Confirm  Password ");
   theForm.confirmPwd.focus();
   return false;
   }
   if(theForm.pwd.value != theForm.confirmPwd.value)
   {
	alert("Password mismatch, Re-Enter password again");
    	theForm.confirmPwd.focus();
    	return false;
    }
  if(theForm.firstName.value== "")        
   {
   alert("Enter your First Name ");
   theForm.firstName.focus();
   return false;
   }
   if(theForm.lastName.value== "")        
   {
   alert("Enter your Last Name ");
   theForm.lastName.focus();
   return false;
   }


   if(theForm.address1.value== "")        
   {
   alert("Enter your Address1 ");
   theForm.address1.focus();
   return false;
   }
   if(theForm.city.value== "")        
   {
   alert("Enter your City");
   theForm.city.focus();
   return false;
   }
    if(theForm.state.value== "null")        
   {
   alert("Select your State");
   theForm.state.focus();
   return false;
   }
    if(theForm.zip.value== "")        
   {
   alert("Enter your ZIP Code");
   theForm.zip.focus();
   return false;
   }
   if(!numberval(theForm.zip.value))
   {
   alert("Enter valid Zip Code");
   theForm.zip.focus();
   return false;
   }
   if(!numberval(theForm.phone.value))
   {
   alert("Enter valid Phone Number");
   theForm.phone.focus();
   return false;
   }
   
   if(theForm.phone.value== "")        
   {
   alert("Enter your Phone Number");
   theForm.phone.focus();
   return false;
   }
   if(theForm.mobile.value != "")
   	if(!numberval(theForm.mobile.value))
   	{
   		alert("Enter valid Mobile Number");
   		theForm.mobile.focus();
   		return false;
   	}
   if(theForm.fax.value != "")
   	if(!numberval(theForm.fax.value))
   	{
   		alert("Enter valid Fax Number");
   		theForm.fax.focus();
   		return false;
   	}
   if(theForm.email.value == "")
   {
   alert("Enter E-mail ID")
   theForm.email.focus();
   return false;
   }
   else
   {
	emailString = theForm.email.value;
	if(emailCheck(emailString));
	else {theForm.email.focus(); return false; }
   }
   return true;
}

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];

// Start by checking that only basic ASCII characters are in the strings (0-127).
var c;c=0;
var flag = new Array();
for (i=0; i<user.length; i++) {
	if ( (user.charCodeAt(i)>=48 && user.charCodeAt(i)<= 57 )||(user.charCodeAt(i)>=65 && user.charCodeAt(i)<=90 ) ||(user.charCodeAt(i)==95 ) ||(user.charCodeAt(i)==46 )|| (user.charCodeAt(i)>=97 && user.charCodeAt(i) <= 122 ) ) 
	{      
		if((user.charCodeAt(i)==95 ) ||(user.charCodeAt(i)==46 )) {flag[c++] = i;}
		if(c == 2 && flag[0] == i-1) 	{
			alert("There is no two Special characters followed.");
			return false;           }
	}
	 else
	{
		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;
   }
}

// See if "user" is valid 

if (user.match(userPat)==null) {

// user is not valid

alert("The username doesn't seem to be valid.");
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) {
alert("Destination IP address is invalid!");
return false;
   }
}
return true;
}

// Domain is symbolic name.  Check if it's valid.
 
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;
 	  }
	
	for(j=0;j<domArr[i].length;j++)
		if ((domArr[i].charCodeAt(j)>=48 && domArr[i].charCodeAt(j)<= 57 ) || (domArr[i].charCodeAt(j)>=65 && domArr[i].charCodeAt(j)<=90 ) || (domArr[i].charCodeAt(j)>=97 && domArr[i].charCodeAt(j) <= 122 ) ) ;
	else{
		alert("Invalied Character in the domain name.");
		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 suffix");
return false;
}*/

// Make sure there's a host name preceding the domain.

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

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

function numberval(num)
{
   var i=0;
   for(i=0;i<num.length;i++)
   {
   if(num.charAt(i) < '0'|| num.charAt(i) > '9')
   return false;
   }
   return true;
}