var img ='';
function ChangeOver(ele,nomeimg,gj){
	img = "images/"+nomeimg+"_over."+gj;
	document.getElementById(ele).src=img;
}
function ChangeOut(ele,nomeimg,gj){
	img = "images/"+nomeimg+"."+gj;
	document.getElementById(ele).src=img;
}
function CheckMail(string, req) {
	if(!req && !string.length) return true;
	if(req && !string.length) return false;
	else {
		regexpCtrl = /^(\w+(?:\.\w+)*(?:\-\w+)*)@((?:\w\.)*\w[\w-]{0,66})\.(\w{2,66}(?:\.\w{2,6})?)$/i
		if(!regexpCtrl.test(string)) return false;
	}
	return true;
}