function isEmailAddress(string) {
    return /^[^@]+@[^.]+(\.[^.]+)+$/.test(string);
}

function validate(form) {
    var noerror = true;
    var invalidemail = false;
    var ischecked = false;
    var controls = form.elements,
        emailAddress = controls['Email'].value;
        Lastname = controls['Lastname'].value;
        Firstname = controls['Firstname'].value;
        Company = controls['Company'].value;
        Country = controls['Country'].value;
        Telephone = controls['Telephone'].value;
        InquiryDescription = controls['Inquiry Description'].value;

   	  if(Lastname== ''){
   		alert('Please enter a valid Last Name');
   	   	return false;  
   	  }
   	  if(Firstname== ''){
   		alert('Please enter a valid First Name');
   	   	return false;	  
   	  }
      if(Company== ''){
   		alert('Please enter a valid Company or Institution Name');
   	   	return false;
   	  }
   	  if(Country== ''){
   		alert('Please enter a valid Country Name');
   	   	return false;  
   	  }
   	  if(!isEmailAddress(emailAddress))
 	  {
 	   	alert('Please enter a valid Email Address');
 	   	return false;
 	  }
   	  if(Telephone== ''){
   		alert('Please enter a valid Telephone Number');
   	   	return false;  
   	  }
   	  
   	 if(InquiryDescription== ''){
   		alert('Please enter an Inquiry Description');
   	   	return false;	  
   	  }

}