function checkForm()
{
    var cname, cphone, cemail, cinquiry;
    with(window.document.contactForm)
    {
    	cname    = name;
        cphone   = phone;
        cemail   = email;
        cinquiry = inquiry;
    }
	
    if(trim(cname.value) == '')
    {
    	alert('Please enter your name');
        cname.focus();
        return false;
    }
    else if(trim(cphone.value) == '')
    {
    	alert('Please enter a contact phone');
        cphone.focus();
        return false;
    }
    else if(trim(cemail.value) == '')
    {
    	alert('Please enter a contact email');
        cemail.focus();
        return false;
    }
    else if(!isEmail(trim(cemail.value)))
    {
    	alert('Email address is not valid');
      	cemail.focus();
      	return false;
   	}
   	else if(trim(cinquiry.value) == '')
   	{
      	alert('Please enter your message');
      	cinquiry.focus();
      	return false;
   	}
  	else
   	{
      	cname.value    = trim(cname.value);
      	cemail.value   = trim(cemail.value);
      	cphone.value   = trim(cphone.value);
      	cinquiry.value = trim(cinquiry.value);
      	return true;
   	}
}

function trim(str)
{
   	return str.replace(/^\s+|\s+$/g,'');
}

function isEmail(str)
{
   	var regex = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	return regex.test(str);
}