function clear_input(element_id){
	var element;
	element = document.getElementById(element_id);
	
	if(element.value == "inserisci nome artista"){
		element.style.fontStyle = "normal";
		element.style.color = "#000";
		element.value = "";		
	}
	
	return false;
}

function rollover(element, imagepath){
	var newimg = new Image();
	newimg.src = imagepath;
	
	document.getElementById(element).src = imagepath;
}

var interval_id_1;
var interval_id_2;
var interval_id_3;

function loader(id_counter){
	var temp_element;
	temp_element = 'event_box_table_1_1';
	var i;

	/*FIRST COLUMN*/

	for(i = 2; i <= 10; i++){
		if(document.getElementById('event_box_table_1_' + i) != null)
			document.getElementById('event_box_table_1_' + i).style.display = "none";
	}
	
	if(document.getElementById(temp_element) != null){
		document.getElementById(temp_element).style.display = "block";

		//interval start
		interval_id_1 = window.setInterval("news_home_slideshow(1)", 20000);
	}

	/*SECOND COLUMN*/
	temp_element = 'event_box_table_2_1';

	for(i = 2; i <= 10; i++){
		if(document.getElementById('event_box_table_2_' + i) != null)
			document.getElementById('event_box_table_2_' + i).style.display = "none";
	}
	
	if(document.getElementById(temp_element) != null){
		document.getElementById(temp_element).style.display = "block";

		//interval start
		interval_id_2 = window.setInterval("news_home_slideshow(2)", 20000);
	}

	/*THIRD COLUMN*/
	temp_element = 'event_box_table_3_1';

	for(i = 2; i <= 10; i++){
		if(document.getElementById('event_box_table_3_' + i) != null)
			document.getElementById('event_box_table_3_' + i).style.display = "none";
	}
	
	if(document.getElementById(temp_element) != null){
		document.getElementById(temp_element).style.display = "block";

		//interval start
		interval_id_3 = window.setInterval("news_home_slideshow(3)", 20000);
	}

	return false;
}

function news_home_slideshow(column){
	var id_counter;
	var i;
	var next;
	var visible_div;
	var current_id;
	
	id_counter = news_home_slideshow_element_counter(column);
	next = 'none';

	for(i = 1; i <= id_counter; i++){
		id = 'event_box_table_' + column + '_' + i;

		if(document.getElementById){
			if(document.getElementById(id) != null){
				if(document.getElementById(id).style.display == 'block'){
					visible_div = i;
				}
			}
		}
	}
	
	if(visible_div == id_counter){
		//start over
		current_id = 'event_box_table_' + column + '_' + visible_div;
		new_id = 'event_box_table_'  + column + '_1';
		
		//current_button_id = 'element_button_' + visible_div;
		//new_button_id = 'element_button_1';
	}
	else{
		current_id = 'event_box_table_'  + column + '_' + visible_div;
		//current_button_id = 'element_button_' + visible_div;
		
		visible_div = visible_div + 1;

		new_id = 'event_box_table_'  + column + '_' + visible_div;	
		//new_button_id = 'element_button_' + visible_div;
	}

	//alert(current_id);
	document.getElementById(current_id).style.display = 'none';
	document.getElementById(new_id).style.display = 'block';

	//document.getElementById(current_button_id).style.backgroundColor = '#09d';
	//document.getElementById(new_button_id).style.backgroundColor = '#900';
}

function news_home_slideshow_element_counter(column){
	counter = 0;

	for(i = 1; i <= 10; i++){
		if(document.getElementById("event_box_table_" + column + '_' + i) != null)
			counter++;
	}
	
	return counter;
}

function home_programma_div(element_id){
	var i;
	var element;
	var element_id_array = new Array();

	element = document.getElementById(element_id);
	
	element_id_array[0] = "programma1";
	element_id_array[1] = "programma2";
	element_id_array[2] = "programma3";
	element_id_array[3] = "programma4";
	element_id_array[4] = "programma5";
	element_id_array[5] = "programma6";
	element_id_array[6] = "programma7";
	element_id_array[7] = "programma8";
	element_id_array[8] = "programma9";
	element_id_array[9] = "programma10";

	for(i = 0; i < element_id_array.length; i++){
		if(element_id == element_id_array[i]){
		 	if(document.getElementById(element_id_array[i]).style.display == "block")
				document.getElementById(element_id_array[i]).style.display = "none";
			else
				document.getElementById(element_id_array[i]).style.display = "block";
		}
		else{
			document.getElementById(element_id_array[i]).style.display = "none";
		}
	}
}