jQuery.fn.validateDate=function(a){
    var b=this;
    var c=b.val().split("/");
    var dia=c[0];
    var mes=c[1];
    var ano=c[2];
    var dataHoje=new Date();
    var diaHoje=dataHoje.getDate();
    var mesHoje=(dataHoje.getMonth() + 1);
    var anoHoje=dataHoje.getFullYear();
    var regDate=/^((0[1-9]|[12]\d)\/(0[1-9]|1[0-2])|30\/(0[13-9]|1[0-2])|31\/(0[13578]|1[02]))\/(19|20)?\d{2}$/;
    if(new Date(mes+"/"+dia+"/"+ano)>new Date(mesHoje+"/"+diaHoje+"/"+anoHoje)){
	return false;
    }else{
	if(b.val().match(regDate)==null){
	    return false;
	}else{
	    return true;
	}
    }
};