// JavaScript Document

/*
	This function is called when
	the 'Sign Guestbook' button is pressed
	Output : true if all input are correct, false otherwise
*/
function checkForm()
{
	// the variables below are assigned to each
	// form input 
	var gname, gemail, gurl, gmessage;
	with(window.document.guestform)
	{
		gmessage = mtxMessage;
		gname    = FName;
		gemail   = txtEmail;
		gurl     = txtUrl;
		
	}
	
	// if name is empty alert the visitor
	 if(trim(gmessage.value) == '')
	{
		alert('Please enter your message');
		gmessage.focus();
		return false;
	}
	else if(trim(gname.value) == '')
	{
		alert('Please enter your name');
		gname.focus();
		return false;
	}
	// alert the visitor if email is empty or the format is not correct 
	else if(trim(gemail.value) != '' && !isEmail(trim(gemail.value)))
	{
		alert('Please enter a valid email address or leave it blank');
		gemail.focus();
		return false;
	}
	// alert the visitor if message is empty
	else if(trim(gmessage.value) == '')
	{
		alert('Please enter your message');
		gmessage.focus();
		return false;
	}
	else
	{
		// when all input are correct 
		// return true so the form will submit		
		return true;
	}
}

/*
Strip whitespace from the beginning and end of a string
Input  : a string
Output : the trimmed string
*/
function trim(str)
{
	return str.replace(/^\s+|\s+$/g,'');
}

/*
Check if a string is in valid email format. 
Input  : the string to check
Output : true if the string is a valid email address, false otherwise.
*/
function isEmail(str)
{
	var regex = /^[-_.a-z0-9]+@(([-a-z0-9]+\.)+(ad|ae|aero|af|ag|ai|al|am|an|ao|aq|ar|arpa|as|at|au|aw|az|ba|bb|bd|be|bf|bg|bh|bi|biz|bj|bm|bn|bo|br|bs|bt|bv|bw|by|bz|ca|cc|cd|cf|cg|ch|ci|ck|cl|cm|cn|co|com|coop|cr|cs|cu|cv|cx|cy|cz|de|dj|dk|dm|do|dz|ec|edu|ee|eg|eh|er|es|et|eu|fi|fj|fk|fm|fo|fr|ga|gb|gd|ge|gf|gh|gi|gl|gm|gn|gov|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|hn|hr|ht|hu|id|ie|il|in|info|int|io|iq|ir|is|it|jm|jo|jp|ke|kg|kh|ki|km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly|ma|mc|md|mg|mh|mil|mk|ml|mm|mn|mo|mp|mq|mr|ms|mt|mu|museum|mv|mw|mx|my|mz|na|name|nc|ne|net|nf|ng|ni|nl|no|np|nr|nt|nu|nz|om|org|pa|pe|pf|pg|ph|pk|pl|pm|pn|pr|pro|ps|pt|pw|py|qa|re|ro|ru|rw|sa|sb|sc|sd|se|sg|sh|si|sj|sk|sl|sm|sn|so|sr|st|su|sv|sy|sz|tc|td|tf|tg|th|tj|tk|tm|tn|to|tp|tr|tt|tv|tw|tz|ua|ug|uk|um|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|ye|yt|yu|za|zm|zw)|(([0-9][0-9]?|[0-1][0-9][0-9]|[2][0-4][0-9]|[2][5][0-5])\.){3}([0-9][0-9]?|[0-1][0-9][0-9]|[2][0-4][0-9]|[2][5][0-5]))$/i;
	return regex.test(str);
}

<!--
function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
//-->

function validateSignup()
{
	var email = document.getElementById('email').value;
	var fname = document.getElementById('fname').value;
	var lname = document.getElementById('lname').value;
	var qli = document.getElementById('qli').value;
	var job = document.getElementById('job').value;company
	var company = document.getElementById('company').value;company
	var address = document.getElementById('address').value;
	var city = document.getElementById('city').value;
	var zip = document.getElementById('zip').value;
	
	if(email == '' || email.search(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/) == -1)
	{
		alert("Please Enter Your Email");
		document.getElementById('email').focus();
		return false;
	}
	else if(fname == '')
	{	
		alert("Please Enter Your First Name");
		document.getElementById('fname').focus();
		return false;
	}
	else if(lname == '')
	{
		alert("Please Enter Last Name");
		document.getElementById('lname').focus();
		return false;
	}
	else if(qli == '')
	{
		alert("Please Enter Qualification");
		document.getElementById('qli').focus();
		return false;
	}
	else if(job == '')
	{
		alert("Please Enter Job Function");
		document.getElementById('job').focus();
		return false;
	}
	else if(company == '')
	{
		alert("Please Enter Company");
		document.getElementById('company').focus();
		return false;
	}
	else if(address == '')
	{
		alert("Please Enter address");
		document.getElementById('address').focus();
		return false;
	}
	else if(city == '')
	{
		alert("Please Enter City");
		document.getElementById('city').focus();
		return false;
	}
	else if(zip == '')
	{
		alert("Please Enter Zipcode");
		document.getElementById('zip').focus();
		return false;
	}
	else
	{
		return true;
	}
}