function init() {
	document.getElementById('file_upload_form').onsubmit=function() {
		document.getElementById('file_upload_form').target = 'upload_target'; //'upload_target' is the name of the iframe
	}
}
window.onload=init;

function insertPicture() {
	document.getElementById("file_input").style.display='';
}

function nahled() {
	var obsah = document.getElementById("textarea").value;
	document.getElementById("textarea2").value = obsah;
	
	window.open("", "nahled");
	document.getElementById('nahled').target = 'nahled';
}