function validateEmail(sEmail){
	var re = new RegExp("^([a-zA-Z0-9])+([a-zA-Z0-9\._-])*@([a-zA-Z0-9_-])+([a-zA-Z0-9\._-]+)+$","ig");
	var result = re.exec(sEmail);
	return (result!=null);
}
function validateAsPassword(){
	var re = new RegExp("^([a-zA-Z0-9]){6,}","ig");
	var error_msg=$(''+this.id+'_error');
	if(re.exec(this.value)!=null){
		error_msg.setStyle('display','none');
		return true;
	}else if(this.value!=''){
		error_msg.setStyle('display','block');
		return false;
	}
}