// JavaScript Document
function validate(){
	formObj = $('theform');
	var fields = formObj.elements;
	for(var i=0; i<fields.length; i++){
		switch(fields[i].name){			
			case "email":
			if(emptyField(fields[i]) || !validateEmail(fields[i].value)){
				alert("Please submit a valid email address"); return false;
			}
			break;

			case "field":
			if(emptyField(fields[i])){alert("Please submit your field"); return false;}
			break;

			case "name":
			if(emptyField(fields[i])){alert("Please submit your first name"); return false;}
			break;
			
			case "lname":
			if(emptyField(fields[i])){alert("Please submit your last name"); return false;}
			break;
			
			case "affiliation":
			if(emptyField(fields[i])){alert("Please submit your institutional affiliation"); return false;}
			break;
			
			case "security_code":
			if(emptyField(fields[i])){alert("Please submit security code"); return false;}
			break;
			
			default:
			break;
		}
	}	
	
		$('ajax-loader').style.display = "inline";
		new Ajax.Request('scripts/validateCode.php',
		{
		    method:'post',
			parameters: formObj.serialize(true),
		    onSuccess: function(transport){ 
				if(transport.responseText == '0'){
					$('ajax-loader').style.display = 'none';
					alert("Wrong security code");
					$('sec_img_cont').innerHTML = '<img src="scripts/CaptchaSecurityImages.php?width=80&height=25&characters=4&reg='+Math.random()+'" />';
				}
				else{
					$('content').innerHTML = '<br />Your subscription was successful.<br /><br /><br /><br /><br />';;
				}
			},
		    onFailure: function(){ alert('Something went wrong...'); }
		});
	
}

function validateEmail(email) {
	var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
	if(reg.test(email) == false) {
		return false;
	}
	return true;
}

function emptyField(textObj){
	if (textObj.value.length == 0) return true;
	for (var i=0; i<textObj.value.length; i++) {
		var ch = textObj.value.charAt(i);
		if (ch != ' ' && ch != '\t') return false;	
	}
	return true;	
}