function check_val(){	 
	if(document.commentform.author.value ==""){
		alert("Please Provide your Name.");
		document.commentform.author.focus();
		return false;
	}	
	if(document.commentform.email.value == ""){
		alert("Please provide your Email Address.");
		document.commentform.email.focus();
		return false;
	}
	str = document.commentform.email.value;
	if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(str)){
	//return true;
	}else{
	alert("You have entered an in-valid Email Address.")
	document.commentform.email.focus();
	return false;
	}	
	if(document.commentform.comment.value ==""){
		alert("Please type a comment.");
		document.commentform.comment.focus();
		return false;
	}	
	if(document.commentform.securitycode.value ==""){
		alert("Please enter security code.");
		document.commentform.securitycode.focus();
		return false;
	}		
	
return true;
 }