function showTab(lang){
	switch (lang){
		case 'es':
			document.getElementById('tab_content_es').style.display = 'inline-block';
			document.getElementById('tab_content_eu').style.display = 'none';
			document.getElementById('tab_content_en').style.display = 'none';
			document.getElementById('tab_selector_es').style.color = '#000000';
			document.getElementById('tab_selector_eu').style.color = '#8899bb';
			document.getElementById('tab_selector_en').style.color = '#8899bb';
			document.getElementById('tab_selector_es').style.zIndex = '3';
			document.getElementById('tab_selector_eu').style.zIndex = '1';
			document.getElementById('tab_selector_en').style.zIndex = '1';
			document.getElementById('tab_selector_es').style.borderBottom = '0em solid #000000';
			document.getElementById('tab_selector_eu').style.borderBottom = '0.1em solid #000000';
			document.getElementById('tab_selector_en').style.borderBottom = '0.1em solid #000000';
			break;
		case 'eu':
			document.getElementById('tab_content_es').style.display = 'none';
			document.getElementById('tab_content_eu').style.display = 'inline-block';
			document.getElementById('tab_content_en').style.display = 'none';
			document.getElementById('tab_selector_es').style.color = '#8899bb';
			document.getElementById('tab_selector_eu').style.color = '#000000';
			document.getElementById('tab_selector_en').style.color = '#8899bb';
			document.getElementById('tab_selector_es').style.zIndex = '1';
			document.getElementById('tab_selector_eu').style.zIndex = '3';
			document.getElementById('tab_selector_en').style.zIndex = '1';
			document.getElementById('tab_selector_es').style.borderBottom = '0.1em solid #000000';
			document.getElementById('tab_selector_eu').style.borderBottom = '0em solid #000000';
			document.getElementById('tab_selector_en').style.borderBottom = '0.1em solid #000000';
			break;
		case 'en':
			document.getElementById('tab_content_es').style.display = 'none';
			document.getElementById('tab_content_eu').style.display = 'none';
			document.getElementById('tab_content_en').style.display = 'inline-block';
			document.getElementById('tab_selector_es').style.color = '#8899bb';
			document.getElementById('tab_selector_eu').style.color = '#8899bb';
			document.getElementById('tab_selector_en').style.color = '#000000';
			document.getElementById('tab_selector_es').style.zIndex = '1';
			document.getElementById('tab_selector_eu').style.zIndex = '1';
			document.getElementById('tab_selector_en').style.zIndex = '3';
			document.getElementById('tab_selector_es').style.borderBottom = '0.1em solid #000000';
			document.getElementById('tab_selector_eu').style.borderBottom = '0.1em solid #000000';
			document.getElementById('tab_selector_en').style.borderBottom = '0em solid #000000';
			break;
	}
}

function validateActivity(){
	var text_es = document.getElementById('text_es').value;
	var text_eu = document.getElementById('text_eu').value;
	var text_en = document.getElementById('text_en').value;
	var title_es = document.getElementById('title_es').value;
	var title_eu = document.getElementById('title_eu').value;
	var title_en = document.getElementById('title_en').value;
	result = true;
	
	//Spanish fields empty
	if (title_es.length < 1){
		result = false;
		alert("Introduce un titulo en castellano");
		return false;
	}
	if (text_es.length < 1){
		result = false;
		alert("Introduce un texto en castellano");
		return false;
	}
	
	//Titles without texts
	if (title_eu.length > 0 && text_eu.length < 1){
		result = false;
		alert("Introduce un texto o borra el titulo en euskera")
		return false;
	}
	if (title_en.length > 0 && text_en.length < 1){
		result = false;
		alert("Introduce un texto o borra el titulo en ingles")
		return false;
	}
	
	//Text without titles
	if (text_eu.length > 0 && title_eu.length < 1){
		result = false;
		alert("Introduce un titulo o borra el texto en euskera")
		return false;
	}
	if (text_en.length > 0 && title_en.length < 1){
		result = false;
		alert("Introduce un titulo o borra el texto en ingles")
		return false;
	}
	
	// TODO: check date
	// TODO: check numeric fields price, people
	return true;
}



function formatText(textarea, format){
	
	var text = textarea.value;
	var selectedText= window.getSelection().toString();
	event.preventDefault();
	//IE
	if (document.selection != undefined){
		textarea.focus();
		var selection = document.selection.createRange();
		selectedText = selection.text;
	}
	
	//Mozilla
	else if (textarea.selectionStart != undefined){
		var startPos = textarea.selectionStart;
		var endPos = textarea.selectionEnd;
		selectedText = textarea.value.substring(startPos, endPos);
	}
	
	var replace;
	switch (format){
		case "italic":
			replace = "<span style='font-style:italic;'>" + selectedText + "</span>";
			break;
		case "bold":
			replace = "<span style='font-weight:bold;'>" + selectedText + "</span>";
			break;
		case "underline":
			replace = "<span style='text-decoration:underline;'>" + selectedText + "</span>";
			break;
		case "stroke":
			replace = "<span style='text-decoration:line-through;'>" + selectedText + "</span>";
			break;
		case "link":
			replace = "<a href='" + selectedText + "'>" + selectedText + "</a>";
			break;
		case "color-red":
			replace = "<span style='color:#f00;'>" + selectedText + "</span>";
			break;
		case "color-green":
			replace = "<span style='color:#0f0;'>" + selectedText + "</span>";
			break;
		case "color-blue":
			replace = "<span style='color:#00f;'>" + selectedText + "</span>";
			break;
		default:
			replace = selectedText;
	}
	
	if (selectedText.length  >0 && text != replace){
		text = text.replace(selectedText, replace);
		textarea.value = text;
	}
}

function previewImage(source, target) {
	var reader = new FileReader();
	reader.readAsDataURL(source.files[0]);

	reader.onload = function (reader_event) {
		target.src = reader_event.target.result;
		target.style.border = "2px solid black";
		target.style.display = "inline";
	};
};

function showNextRow(current){
	if (document.getElementById('sh_' + current).value != '' ||
		document.getElementById('eh_' + current).value != '' || 
		document.getElementById('sm_' + current).value != '' || 
		document.getElementById('em_' + current).value != '' || 
		document.getElementById('place_' + current).value != -1 || 
		document.getElementById('title_es_' + current).value != '' || 
		document.getElementById('title_en_' + current).value != '' || 
		document.getElementById('title_eu_' + current).value != '' || 
		document.getElementById('text_es_' + current).value != '' || 
		document.getElementById('text_en_' + current).value != '' || 
		document.getElementById('text_eu_' + current).value != ''
	){
		document.getElementById('itinerary_row_' + (current + 1)).style.display = 'table-row';
	}
	else{
		document.getElementById('itinerary_row_' + (current + 1)).style.display = 'none';
	}
}