// JavaScript Document


function changeScreens(dir){
	
	if(dir == 'back' && currentScreen != 1){
		hideAllScreens();
		currentScreen--;
		$('#thumbsScreen'+currentScreen).show();
		$('#info2').html('currentScreen '+currentScreen);
	}else if(dir == 'next' && currentScreen < numScreens){
		hideAllScreens();
		currentScreen++;
		$('#thumbsScreen'+currentScreen).show();
	}
	// now do the show hide of the prev/next
	if(dir == 'back' && currentScreen == 1){
		$('#prevLink').hide();
	}else{
		$('#prevLink').show();
	}
	if(dir == 'next' && currentScreen == numScreens){
		$('#nextLink').hide();
	}else{
		$('#nextLink').show();
	}
}
function hideAllScreens(){
	//first hide them all
	for(c=1;c<=numScreens;c++){
		$('#thumbsScreen'+c).hide();
	}
}


//auto load stuff
// NB does not always work on page back
// so this code moved to footer.php
$(document).ready(function() {
    //hideAllScreens();
	//$('#thumbsScreen'+currentScreen).show();
	//alert('document.ready');
});



function startScreens(){
     hideAllScreens();
	 $('#thumbsScreen'+currentScreen).show();
	//alert(currentScreen);
	// now do the show hide of the prev/next
	if(currentScreen == 1){
		$('#prevLink').hide();
	}else{
		$('#prevLink').show();
	}
	if(currentScreen == numScreens){
		$('#nextLink').hide();
	}else{
		$('#nextLink').show();
	}	 
}