$("document").ready(function(){
	$('input:text[name=domain_name]').keyup(function(){
//		var RE = /^[a-zA-Z0-9-]+[a-zA-Z0-9-]$/;
		
//		var RE = /^([a-z0-9]([-a-z0-9]*[a-z0-9])?)$/i;
		var RE = /^[a-z0-9][a-z0-9\-]+[a-z0-9](\.[a-z]{2,4})+$/i;
		
		if(RE.test($('input:text[name=domain_name]').val())){
			$('input:text[name=domain_name]').css({"background":"#fff","color":"#000"});
			$('input:submit[name=submit]').attr("disabled","");
		}else{
			$('input:text[name=domain_name]').css({"background":"#f00","color":"#fff"});		
			$('input:submit[name=submit]').attr("disabled","disabled");			
		}
	});
});