//Commenting this out, since it seems to be a check to make sur browser supports the proper dom manip, 
//but this flag doesnt actually seem to be used ANYWHERE.
//var w3cdom= (document.getElementByTagName && document.createElement);

function initFormValidation() {
	if(document.forms[0]){
		document.forms[0].onsubmit = function (){
			return validate();
		}		
	}
}

function validate (){
	var valid=true, 
		firstError=null;

	var x = document.forms[0].elements;

	var fields = new Array('Address','City','Province','PostalCode','Email', 'Telephone');
	for (i=0;i<fields.length;i++){
		if(YAHOO.util.Lang.isUndefined(x[fields[i]])) {
			continue;
		}

		var field = x[fields[i]];
		if(!field.value){
			writeError(x[fields[i]],'This field is required');
			valid=false;
			if(!firstError){
				firstError = field;
			}
		}			
	}
	if(!valid){
		firstError.focus();
	}
	
	return valid;
	
}

function writeError(field,msg){
	if(field.errorMsg)return;
	sp = document.createElement('div');
	sp.className = 'error';
	sp.appendChild(document.createTextNode(msg));
	field.parentNode.appendChild(sp);
	field.errorMsg = sp;
	field.onchange = removeError;
}

function removeError(){
	this.parentNode.removeChild(this.errorMsg);
	this.errorMsg = null;
	this.onchange = null;
}

YAHOO.util.Event.onDOMReady(initFormValidation);