function checkForm(form) { 
	// validation fails if the input is blank 
	if(form.firstname.value == '') { 
		alert("First Name is required!"); 
		//form.firstname.focus();  
		return false;  
	}
	
	if(form.sender_email.value == '') { 
		alert("Your E-mail Address is required!"); 
		//form.sender_email.focus();  
		return false;  
	} 
	
        if(form.friend_email.value == '') { 
		alert("Your Friend's E-mail Address is required!"); 
		//form.friend_email.focus();  
		return false;  
	} 
	
	
}