Sample java script

	<script type="text/javascript">
	String.prototype.trim = function() { a = this.replace(/^\s+/, ''); return a.replace(/\s+$/, ''); };
	function ascii_value (c)
	{
	// restrict input to a single character
	c = c . charAt (0);
	// loop through all possible ASCII values
	var i;
	for (i = 0; i < 256; ++ i)
	{
	// convert i into a 2-digit hex string
	var h = i . toString (16);
	if (h . length == 1)
	h = "0" + h;
	// insert a % character into the string
	h = "%" + h;
	// determine the character represented by the escape code
	h = unescape (h);
	// if the characters match, we've found the ASCII value
	if (h == c)
	break;
	}
	return i;
	}
	function isNameKey(evt)
	{
	var charCode = (evt.which) ? evt.which : event.keyCode
	if (!((charCode >= 97 && charCode <= 122)|| (charCode >= 65 && charCode <= 90) ||(charCode==32)||(charCode==39)||(charCode==08) ||(charCode==09)) )
	{
	alert("Please Enter Valid Character")
	return false;
	}
	return true;
	}
	function fnlogin()
	{
	var email=new String();
	var textname=new String();
	txtname=document.getElementById("ctl00_ContentPlaceHolder1_textname").value
	email=document.getElementById('ctl00_ContentPlaceHolder1_textemail').value;
	if (txtname.trim()=="")
	{
	alert("Please Enter the name ")
	document.getElementById("ctl00_ContentPlaceHolder1_textname").focus();
	return false
	}
	else
	{
	var t_len2;
	var str3=document.getElementById("ctl00_ContentPlaceHolder1_textname").value;
	t_len2= str3.length;
	for (var iCount = 0; iCount < t_len2; iCount++)
	{
	str4 = str3.substring(iCount, iCount+1);
	var charCode = ascii_value(str4);
	if (!((charCode >= 97 && charCode <= 122) || (charCode >= 65 && charCode <= 90) || (charCode == 32) || (charCode == 39)))
	{
	document.getElementById("ctl00_ContentPlaceHolder1_textname").focus();
	alert("Please Enter Valid Name");
	return false;
	break;
	}
	}
	}
	if(email.trim()=="")
	{
	alert("Please enter email id");
	document.getElementById('ctl00_ContentPlaceHolder1_textemail').focus();
	return false;
	}
	else
	{
	if (!((/^[a-zA-Z0-9_-]+@[a-zA-Z0-9-]+\.[a-zA-Z]{2,4}$/.test(email))||(/^[a-zA-Z0-9_-]+[.]+[a-zA-Z0-9_-]+@[a-zA-Z0-9-]+\.[a-zA-Z]{2,4}$/.test(email))||(/^[a-zA-Z0-9_-]+[.]+[a-zA-Z0-9_-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-]+\.[a-zA-Z]{2,4}$/.test(email))||(/^[a-zA-Z0-9_-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-]+\.[a-zA-Z]{2,4}$/.test(email))||(/^[a-zA-Z0-9_-]+[.]+[a-zA-Z0-9_-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-]+\.[a-zA-Z]{2,4}$/.test(email))))
	{
	alert("Please Enter a Valid Email ID.");
	document.getElementById('ctl00_ContentPlaceHolder1_textemail').focus();
	return false
	}
	}
	if(document.getElementById("ctl00_ContentPlaceHolder1_textproble").value=="")
	{
	alert("Please Enter the Problem/Suggestion ")
	document.getElementById("ctl00_ContentPlaceHolder1_textproble").focus()
	return false
	}
	else
	{
	var textproble=document.getElementById("ctl00_ContentPlaceHolder1_textproble").value;
	if(textproble.trim()=="")
	{
	var tadd_len2= textproble.length;
	for (var iCount = 0; iCount < tadd_len2; iCount++)
	{
	var str4 = textproble.substring(iCount,iCount+1);
	//alert(str4);
	var charCode = ascii_value(str4);
	//alert(charCode);
	//Response.Write(asc_num.ToString() + " ");
	if (charCode==32)
	{
	alert("please enter valid problem.");
	document.getElementById('ctl00_ContentPlaceHolder1_textproble').focus();
	return false;
	break;
	}
	break;
	}
	// return false;
	}
	}
	var varlen=document.getElementById('ctl00_ContentPlaceHolder1_textproble').value;
	if(varlen.length>7000)
	{
	alert("Please enter maximum 7000 characters!!");
	return false
	}
	}
	</script>
	<script type="text/javascript">
	function ok(sender, e)
	{
	$find('ModalPopupExtenderLogin').hide();
	__doPostBack('LoginBtn', e);
	}
	function okJoin(sender, e)
	{
	$find('ModalPopupExtenderSignup').hide();
	__doPostBack('JoinBtn', e);
	}
	function OnKeyPress(args)
	{
	if(args.keyCode == Sys.UI.Key.esc)
	{
	$find("ModalPopupExtenderLogin").hide();
	}
	}
	function body_onkeydown()
	{
	if(event.keyCode==13 || event.keyCode==27)
	{
	var _defaultButtonName=getDefautButtonName( event.keyCode==13 ? "submitButton" : "cancelButton");
	var frm=document.forms[0];
	if(frm && document.all(_defaultButtonName))
	{
	document.all(_defaultButtonName).click();
	}
	}
	}
	function getDefautButtonName(className)
	{
	var _defaultButtonName="";
	var children = document.getElementsByTagName("input");
	for (var i = 0; i < children.length; i++)
	{
	var child = children[i];
	var btnAction = child.buttonAction;
	if(btnAction == className)
	{
	_defaultButtonName = child.id;
	break;
	}
	}
	return _defaultButtonName;
	}
	function launchModal2()
	{
	//alert("helo");
	var mpsh=$find("ModalPopupExtender1");
	mpsh.show();
	}
	</script>