function checkdata(){
 	
 	if(document.phrasesearch.author.value=="" && document.phrasesearch.title.value==""
		&& document.phrasesearch.keyword.value=="")
	{
		alert("You must enter at least one item: author, title, or keyword!");
		document.phrasesearch.author.focus();
		return false;
	}
	if(document.phrasesearch.year1.value !="" && document.phrasesearch.year1.value.length !=4)
	{
	    alert("The Year must be 4-digit!");
		document.phrasesearch.year1.focus();
		return false;
	}
	if(document.phrasesearch.year2.value !="" && document.phrasesearch.year2.value.length !=4)
	{
	    alert("The Year must be 4-digit!");
		document.phrasesearch.year2.focus();
		return false;
	}
 }
function check_berita_data(){
 	
 	if(document.phrasesearch.author.value=="" && document.phrasesearch.title.value==""
		&& document.phrasesearch.keyword.value==""
		&& document.phrasesearch.subject.value=="")
	{
		alert("You must enter at least one item: author, title, subject or keyword!");
		document.phrasesearch.author.focus();
		return false;
	}
	if(document.phrasesearch.year1.value !="" && document.phrasesearch.year1.value.length !=4)
	{
	    alert("The Year must be 4-digit!");
		document.phrasesearch.year1.focus();
		return false;
	}
	if(document.phrasesearch.year2.value !="" && document.phrasesearch.year2.value.length !=4)
	{
	    alert("The Year must be 4-digit!");
		document.phrasesearch.year2.focus();
		return false;
	}
 }
 function clear_sub(  ) {
   	
   	//This function is called when the user has selected the upper one
      
   	document.phrasesearch.author.value = "";
   	document.phrasesearch.title.value = "";
   	document.phrasesearch.keyword.value = "";
    document.phrasesearch.keyword1.value = "";
    document.phrasesearch.language.value = "";
  	document.phrasesearch.year1.value = "";
  	document.phrasesearch.year2.value = "";
    
     }
     
  function onlyEng(){
  	 if(!((event.keyCode>=65&&event.keyCode<=90)||(event.keyCode==8 ||event.keyCode ==32 ||event.keyCode ==13)))
     event.returnValue=false;
    }

function changePage(page,sort)
{
  document.changePageForm.page.value = page;
  document.changePageForm.sortBy.value = sort;
  for(var i=0;i<changePageForm.elements.length;i++) 
	{ 
	if(document.changePageForm.elements[i].type == "checkbox" && document.changePageForm.elements[i].checked == true) 
	document.changePageForm.elements[i].checked = false; 
	} 
  document.changePageForm.submit();
}


function DispDetail(page)
{
    document.changePageForm.page.value = page;
    document.changePageForm.submit();
    return;
}
function DisSelectAll()
{
    document.changePageForm.reset();
}
function SelectAll(){
	for(var i=0;i<changePageForm.elements.length;i++) 
	{ 
		if(document.changePageForm.elements[i].type == "checkbox" && document.changePageForm.elements[i].checked == false) 
			document.changePageForm.elements[i].click(); 
	} 
} 

function switchMenu(obj) {
	var el = document.getElementById(obj);
	if ( el.style.display != "none" ) {
		el.style.display = 'none';
	}
	else {
		el.style.display = '';
	}
}
function showMenu(obj) {
	var el = document.getElementById(obj);
	el.style.display = '';
}
function hiddenMenu(obj) {
	var el = document.getElementById(obj);
	el.style.display = 'none';
}