function if_empty(id, msg){
   if(document.getElementById(id).value == ""){
     alert(msg);
	 document.getElementById(id).focus();
	 return false;
   }
}

function check_email(mail){
 
    var mail = document.getElementById(mail).value;

	if ((mail.indexOf ('@') == -1) || (mail.indexOf ('.') == -1) || (mail.indexOf (' ') != -1)){
	   return false;
    }else{
	  return true;
	}
}
	
 function IsNumeric(value) {
  
  var nums = "0123456789.";

  for (var n=0; n < value.length; n++){
      if(nums.indexOf(value.charAt(n))==-1)return(false);
  }
  
  return(true);
 }
 
 function numeric(id) {
  if(document.getElementById(id).value != ""){	 
   if(!IsNumeric(document.getElementById(id).value)){
	 alert("Introduceti cifre!");
	 document.getElementById(id).focus();
	 return false;   
   }else{
	 return true;   
   }
  }else{
return true;  
  }
 }