function validate_Contact()  
{
   var r,reph;
   r =/(^\s*)|(\s*$)/g;
   reph =/[^0-9]/g;
   var sAltMail = ""+document.forms[0].txtemail.value.replace(r,"");
    
    if (document.forms[0].txtname.value.replace(r,"").length == 0) 
     {
          alert('Please enter your Name'); 
          document.forms[0].txtname.focus();
          return false;
    }             

	if (sAltMail.length > 0)
	{
			if (!emailCheck(sAltMail))
					return false;
	}
	else
	{
	    alert("Please enter your E-mail");
		document.forms[0].txtemail.focus();
		return false;	
	} 
	if (document.forms[0].txtdesc.value.replace(r,"").length == 0) 
     {
          alert('Please enter short description'); 
          document.forms[0].txtdesc.focus();
          return false;
    }  
	if (document.forms[0].txtcomment.value.replace(r,"").length == 0) 
     {
          alert('Please enter your Message'); 
          document.forms[0].txtcomment.focus();
          return false;
    }  
	return true;
}

function emailCheck (emailStr) 
{
/* The following pattern is used to check if the entered e-mail address
   fits the user@domain format.  It also is used to separate the username
   from the domain. */
var emailPat=/^(.+)@(.+)$/;
/* The following string represents the pattern for matching all special
   characters.  We don't want to allow special characters in the address. 
   These characters include ( ) < > @ , ; : \ " . [ ]    */
var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]";
/* The following string represents the range of characters allowed in a 
   username or domainname.  It really states which chars aren't allowed. */
var validChars="\[^\\s" + specialChars + "\]";
/* The following pattern applies if the "user" is a quoted string (in
   which case, there are no rules about which characters are allowed
   and which aren't; anything goes).  E.g. "jiminy cricket"@disney.com
   is a legal e-mail address. */
var quotedUser="(\"[^\"]*\")"
/* The following pattern applies for domains that are IP addresses,
   rather than symbolic names.  E.g. joe@[123.124.233.4] is a legal
   e-mail address. NOTE: The square brackets are required. */
var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;
/* The following string represents an atom (basically a series of
   non-special characters.) */
var atom=validChars + '+';
/* The following string represents one word in the typical username.
   For example, in john.doe@somewhere.com, john and doe are words.
   Basically, a word is either an atom or quoted string. */
var word="(" + atom + "|" + quotedUser + ")"
// The following pattern describes the structure of the user
var userPat=new RegExp("^" + word + "(\\." + word + ")*$");
/* The following pattern describes the structure of a normal symbolic
   domain, as opposed to ipDomainPat, shown above. */
var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");
/* Finally, let's start trying to figure out if the supplied address is
   valid. */
/* Begin with the coarse pattern to simply break up user@domain into
   different pieces that are easy to analyze. */
var matchArray=emailStr.match(emailPat);
if (matchArray==null) {
  /* Too many/few @'s or something; basically, this address doesn't
     even fit the general mould of a valid e-mail address. */
        alert("Email address seems incorrect (check @ and .'s)");
        return false;
}
var user=matchArray[1];
var domain=matchArray[2];

// See if "user" is valid 
if (user.match(userPat)==null) 
{
    // user is not valid
    alert("The username in email address doesn't seem to be valid.");
    return false;
}

/* if the e-mail address is at an IP address (as opposed to a symbolic
   host name) make sure the IP address is valid. */
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 in email address is invalid!");
                return false;
            }
    }
    return true;
}

// Domain is symbolic name
var domainArray=domain.match(domainPat)
if (domainArray==null) {
        alert("The domain name in email address doesn't seem to be valid.");
    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>3) {
   // the address must end in a two letter or three letter word.
   alert("The address must end in a three-letter domain, or two letter country.");
   return false;
}

// Make sure there's a host name preceding the domain.
if (len<2) {
   var errStr="Email address is missing a hostname!";
   alert(errStr);
   return false;
}

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

function WindowOpen(url)
{						
	window.open(url, "", "height=600,width=550,status=yes,toolbar=no,menubar=no,location=no,scrollbars=yes");			
	return false;
}
		
function CloseWindow()
{
	if (navigator.appVersion.indexOf("Macintosh") > -1)
		alert('Please ensure you quit the browser when you have finished using Doctors.net.uk.\r\nPress apple-Q as a shortcut to quit your browser.')
	else
	if (parent) {parent.window.open('','_parent','');parent.window.close();} else {window.open('','_parent','');window.close();}					
}