function validateFeedbackForm(){
		var name=document.feedback.name;		
		var email=document.feedback.email;
		var comments=document.feedback.comments;
	   missinginfo = "";

	 if ((name==null)||(name.value=="")){
		missinginfo += "\n - Please enter name.";
	 }
	 if ((email==null)||(email.value=="")){
		missinginfo += "\n - Please enter your email address.";
	 }	
	 if((email.value!="")){
		  var mail=document.feedback.email.value;
		if(isEmail(mail)!=true){
       		missinginfo+="\n - Please enter a valid email address";
	   }
	 }	 
	 if ((comments==null)||(comments.value=="")){
		missinginfo += "\n - Please enter comments.";
	 }
	if (missinginfo != "") 
	{
		missinginfo ="__________________________________\n" +
		"Required information is missing: \n" +
		missinginfo + "\n__________________________________" +
		"\nPlease check and resubmit.";
		alert(missinginfo);
		return false;
	}
	
	return true;
 }
 
 
 function isEmail(s){
	var regex = /(^[a-z]([a-z_\.]*)@([a-z_\.]*)([.][a-z]{3})$)|(^[a-z]([a-z_\.]*)@([a-z_\.]*)(\.[a-z]{3})(\.[a-z]{2})*$)/i
	var regex =	/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i;
	return regex.test(s);
}

function feedbackForm(){
	if(document.getElementById("feedback_form").style.display == 'none'){
		document.getElementById("feedback_form").style.display = 'block';
	}else{
		document.getElementById("feedback_form").style.display = 'none';
	}
}