function checkEmailUniqueness(){
	var sUrl = site_url_domain + 'osb/pages/registration/ajax.php';
	var sEMail = $F('email_address');
	var sParameters = '&email_address=' + sEMail ;
	var oAjax = new Ajax.Request(sUrl, {asynchronous: false, method: 'post', parameters: sParameters, onComplete: ContinueRegistration});
}

function ContinueRegistration(oResponse){
	var domDoc = oResponse.responseXML;
	
	giEmail = parseInt(domDoc.getElementsByTagName("giemail")[0].firstChild.nodeValue);			
}