var isIE = (navigator.appName.indexOf('Internet Explorer')>-1);
var isNS = (navigator.appName.indexOf('Netscape')>-1);

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_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_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 trim(text)
{
// Erase blank in the most left and most right sections of a string
	var i,j;
	for(i=0; text.charAt(i)==' ' && i<text.length; i++){}
	if(i==text.length) return ''
	for(j=text.length-1; text.charAt(j)==' ' && j>-1; j--){}
	return text.substring(i,j+1);
}

function isBlank(obj,message)
{
//Check whether the Object Value is blank
//If blank, show alert message
	if(trim(obj.value) == ''){
		if(trim(message) != ''){
			obj.focus();
			alert(message);
		}
		return true;
	} else {
		return false;
	}
}

function numberOnly(obj,event) 
{
	var _ret = true;
	if(isIE)
	{
		if (event.keyCode < 46 || event.keyCode > 57)
		{
			_ret = false;
		}
	}

	if(isNS)
	{
		if((event.which < 46 || event.which > 57) && event.which != 8 && event.which != 0)
		{
			_ret = false;
		}
	}

	return (_ret); 
}

function isEmailAddressValid(EmailAddr){
	//Check whether an email address expression is valid
	var re = new RegExp();
	re = /^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,4})+$/;
	if (!re.test(EmailAddr)) {return false;}
	else {return true;}
}

function clearForm()
{
	with(document.frm)
	{	
		first_name.value = "";
		last_name.value = "";
		email.value = "";
		zip.value = "";
	}
}

function validateForm()
{
	with(document.frm){
		if(isBlank(first_name,'Please enter your First Name')) return false;
		if(isBlank(last_name,'Please enter your Last Name')) return false;
		if(isBlank(zip,'Please enter your Zip Code')) return false;;
		if(isBlank(email,'Please enter your Email Address')) return false;
		if(!isEmailAddressValid(email.value))
		{
			alert('Please provide your email in the proper format');
			email.focus();
			return false;
		}
	}
	return true;
}

function submitForm()
{
	if(validateForm())
	{
		document.frm.submit();
	}
}