function pageToString(pageNr){
	counterLength = pageNr.toString().length;
	// 1. znamenka = 0, ukoliko je broj manji od 10 
	if (counterLength == 1) {
		pageNr = "0" + pageNr;
		counterLength++;
	}
	// 2. znamenka = 0, ukoliko je broj manji od 100
	if (counterLength == 2){
		pageNr = "0" + pageNr;
		counterLength++;	
	}
	return pageNr.toString();
}


function gotoPage(pageNr){
	top.page.document.location = pageToString(pageNr) + ".php";
}


function loadPage() {
	var pageNr = document.gotoPage.number.value;
	if (pageNr == "") alert("Unesite broj stranice u polje za unos!");
	else {
 		if (isNaN(pageNr)) {
 			alert("Unesena vrijednost nije broj!");
				document.gotoPage.number.value = "";
				document.gotoPage.number.focus();
 		}
 		else {
 			if ((eval(pageNr) > 0) && (eval(pageNr)) <= lastPage) {
  				// ucitaj stranicu
				gotoPage(eval(pageNr));
				document.gotoPage.number.value = "";
				document.gotoPage.number.focus();
 			}
 			else {
 				alert("Unesite broj veci od 0 i manji od " + (lastPage +1) + "!");
				document.gotoPage.number.value = "";
				document.gotoPage.number.focus();
 			}
 		}
	}
}


function forward(){
	var currentPage = Number(top.page.document.title.substr(0,3));
	if (currentPage < lastPage) {
		currentPage++;
		gotoPage(currentPage);
	}
}


function back(){
	var currentPage = Number(top.page.document.title.substr(0,3));
	if (currentPage > 1) {
		currentPage--;
		gotoPage(currentPage);
	}
}