function Email_Check (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 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 is invalid!")
				return false
			}
		}
		return true
	}

	// Domain is symbolic name
	var domainArray=domain.match(domainPat)
	if (domainArray==null)
	{
		//alert("The domain name 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="This address is missing a hostname!"
		//alert(errStr)
		return false
	}

	// If we've gotten this far, everything's valid!
	return true;
}
/*
var xmlhttp = false;
var control2;
var keysearch;
if (window.ActiveXObject)
{
	xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
else
{
	xmlhttp = new XMLHttpRequest();
	xmlhttp.overrideMimeType('text/xml');
}
function PreSearch(ControlOne, ControlTwo, keySearch, textControl)
{
	var key = document.getElementById(ControlOne).value;
	document.getElementById(textControl).value = key;
	if (keySearch != "Null")
	{
		if (key != "") 
		{				
			control2 = ControlTwo;
			keysearch = keySearch;
			var url = "Search.aspx?Type=" + keySearch + "&key=" + key;
			xmlhttp.open('get',url);
			xmlhttp.onreadystatechange = GetResponse;
			xmlhttp.send(null);
		}
	}
	return;
}
function GetResponse()
{
	if ((xmlhttp.readyState == 4) && (xmlhttp.status == 200))
	{			
		var response = xmlhttp.responseText;				
		var content = new Array();
		var optionItem;
		var j = 0;
		if(response.indexOf("|") != -1)
		{
			content = response.split("|");
			var text;
			var val;
			ClearCombo(control2);
			for (var i=0; i < (content.length - 1);)
			{
				if (i == 0)				
					document.getElementById("txtCommunity").value = content[i];
				
				val = content[i];
				i++;
				text = content[i];				
				i++;
				optionItem = new Option(text,val,false);						
				document.getElementById(control2).options[j] = optionItem;						
				j++;
			}
		}
		else
		{
			ClearCombo(control2);
			optionItem = new Option("--- No Data ---","--- No Data ---",false);
			document.getElementById(control2).options[0] = optionItem;
		}
	}
}
function ClearCombo(control)
{
	var control = document.getElementById(control);
	for (var i = control.options.length; i>-1; i--)
	{
		control.options[i] = null;
	}
}
*/
function Only_NumberCheck(strCharacter)
{
	for (k=0;k<strCharacter.length;k++)
	{
		c = strCharacter.charAt(k);
		if (!(c>='0' && c<='9'))
			return false;
	}
	return true;
}