// function to validate input fields of share article form
function validateShareArticle(form){

	if(form.senderName.value == ""){
		alert("Please enter Sender's name");
		form.senderName.focus();
		return false;
	}
	if(form.senderEmail.value == ""){
		alert("Please enter Sender's Email");
		form.senderEmail.focus();
		return false;
	}
	else if(!isValidEmail(form.senderEmail.value)) {
		alert( "Please enter valid Sender Email address");
		form.senderEmail.focus();
		return false;
	}
	
	var recepientFlag = false;
	
	for(i = 0; i < form.recepientName.length; i++){
		if(form.recepientName[i].value != "" && form.recepientEmail[i].value != ""){
			if(!isValidEmail(form.recepientEmail[i].value)) {
				alert( "Please enter valid Recepient Email address");
				form.recepientEmail[i].focus();
				return false;
			}
			recepientFlag = true;
		}
		if(form.recepientName[i].value != "" && form.recepientEmail[i].value == ""){
			alert('Please enter Recepient Email');
			form.recepientEmail[i].focus();
			return false;
		}
	}
	if(recepientFlag == false){
		alert('Please enter at least one Recepient Name');
		form.recepientName[0].focus();
		return false;
	}
	return true;
}

function isValidEmail(email){
    mailRE = new RegExp( );
    mailRE.compile( '^[\._a-z0-9-]+@[\.a-z0-9-]+[\.]{1}[a-z]{2,4}$', 'gi' );
    return !(mailRE.test(email));
}