function isEmailAddress (string) {
  var addressPattern = 
    /^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/;
  return addressPattern.test(string);
}



function checkform(form){
			
if(form.company.value.length==0 || form.company.value=="***Prosze wpisać firmę"){
form.company.value = "***Prosze wpisać firmę";
form.company.focus();
return  false;
}	
	
if(form.person.value.length==0 || form.person.value=="***Prosze wpisać osobę kontaktowa"){
form.person.value = "***Prosze wpisać osobę kontaktowa";
form.person.focus();
return  false;
}		

if(form.phone.value.length==0 || form.phone.value=="***Prosze wpisać telefon."){
form.phone.value = "***Prosze wpisać telefon.";
form.phone.focus();
return  false;}

if(form.email.value.length==0 || form.email.value=="***Prosze wpisać email."){
form.email.value = "***Prosze wpisać email.";
form.email.focus();
return  false;}

if (!isEmailAddress(form.email.value)) {
form.email.value = "***Prosze wpisać poprawny email.";
form.email.focus();
return  false;}

return true;
}