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Вывод ошибки поля подстветкой

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Когда человек не заполняет поле, то при нажатии кнопки это поле загорается красным....Вроде бы через скрипт нужно...

Нашел на другом форуме...но не пойму как его к опенкарту приварить(( Ниид хелп

function Formdata(data){
if (data.art1 != null && data.art1.value.length < 1 )
{ alert('Заполните поле "art1"');
data.art1.style.backgroundColor = red;
return false; }
if (data.art2 != null && data.art2.value.length < 1){
alert('Заполните поле "art2"');
data.art2.style.backgroundColor = red;
return false;}
if (data.art1.value.indexOf('text') != -1) 
data.art1.style.backgroundColor = red;
return false;


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