function getObject(id){
	return document.getElementById(id);
}

//FIELD HIGHLIGHT
function highlightOn(elm){
	f=document.getElementById(elm);
	f.style.backgroundColor="#A0BCC9";
	f.style.color="#FFFFFF";
}
function highlightOff(elm){
	f=document.getElementById(elm);
	f.style.backgroundColor="#FFFFFF";
	f.style.color="#035FBA";
}

//DISPLAY TOGGLE
function toggle(id){
	elm=getObject(id);
	
	if(elm.style.visibility=='visible'){
		elm.style.visibility='hidden';
		elm.style.display='none';
	}
	else{
		elm.style.visibility='visible';
		elm.style.display='block';
	}
}

//FORM VALIDATION
function checkPassword(){
	pswd1=document.getElementById('f2').value;
	pswd2=document.getElementById('f2b').value;
			
	if(pswd1.length>0&&pswd1==pswd2){
		highlightOff('f2');
		highlightOff('f2b');
		return true;
	}
	else{
		highlightOn('f2');
		highlightOn('f2b');
		return false;
	}
	
}
function checkForm(){
	err=0;
	username=document.getElementById('f1');
	fname=document.getElementById('f3');
	lname=document.getElementById('f4');
	email=document.getElementById('f5');
	
	if(username.value.length<6){err++;highlightOn('f1');}else{highlightOff('f1');}
	if(fname.value.length==0){err++;highlightOn('f3');}else{highlightOff('f3');}
	if(lname.value.length==0){err++;highlightOn('f4');}else{highlightOff('f4');}
	if(email.value.length==0){err++;highlightOn('f5');}else{highlightOff('f5');}
	
	//check for password confirmation
	if(!checkPassword())err++;
	
	// test email against a regular expression
	var emailrule = new RegExp("^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,3}|[0-9]{1,3})(\\]?)$");
	if(!emailrule.test(email.value)){
		err++;
		highlightOn('f5');	
	}
	else{
		highlightOff('f5');	
	}
	
	if(err==0){
		document.getElementById("registrationform").submit();
	}
	else{
		alert("Please complete the hightlighted fields with valid entries");
	}
}

//AJAX
// <script src="http://yui.yahooapis.com/2.2.2/build/yahoo/yahoo-min.js" type="text/javascript"></script>
// <script src="http://yui.yahooapis.com/2.2.2/build/connection/connection-min.js" type="text/javascript"></script> 
function tempname(variables){ 
	elementid='';
	contentarea=document.getElementById(elementid);
	
	contentarea.innerHTML='';
	
	var sUrl="ajax_page.php";
	sUrl=sUrl+"?id="+variable;
	sUrl=sUrl+"&sid="+Math.random();
	
	var callback = {
		success: function(o) {
			contentarea.innerHTML=o.responseText;
		},
		failure: function(o) {
			contentarea.innerHTML='error';
		}
	} 

	var transaction = YAHOO.util.Connect.asyncRequest('GET', sUrl, callback, null);

}

function showImage(imgid){
	elm=getObject('imagePane');
	elm.innerHTML='<img src="gallery/'+imgid+'.jpg" />';
}

function updateImage(imgid){
	elm=getObject('displayImage');
	elm.src='gallery/'+imgid+'.jpg';
}
function updateImageLayer(imgid){
	elm=getObject('imagePane');
	elm.style.background='url(gallery/'+imgid+'.jpg)';
}