/*function displayArticle( item_id, article_filename_suffix ) {
	var article_area = document.getElementById( 'article' );
	var article_filename_prefix = 'article_';
	var article_filename_ext = '.html';

	if	(		article_area != null
			&&	article_filename_suffix.length
			&&	checkIsValidFilename( article_filename_suffix )
			) {
		article_area.src = article_filename_prefix + article_filename_suffix + article_filename_ext;
	}
	return false;
}*/

function displayArticlePicture( picture_filename_suffix ) {
	var picture_area = document.getElementById( 'panel_body_left' );
	var picture_filename_prefix = 'images/article_background_';
	var picture_filename_ext = '.png';

	if	(		picture_area != null
			&&	picture_filename_suffix.length
			&&	checkIsValidFilename( picture_filename_suffix )
			) {
		picture_area.style.backgroundImage = 'url(' + picture_filename_prefix + picture_filename_suffix + picture_filename_ext + ')';
	}
	return false;
}

function checkIsValidFilename( text_to_check ) {
	var enabled_chars = "abcdefghijklmnopqrstuvwxyz0123456789_";
	var is_valid = true;

	for ( i = 0;  i < text_to_check.length;  i++ ) {
		letter = text_to_check.charAt(i);
		for ( j = 0;  j < text_to_check.length;  j++ ) { 
			if ( letter == text_to_check.charAt(j) )
			break;
		}
		if ( j == text_to_check.length ) {
			is_valid = false;
			break;
		}
	}

	return is_valid;
}

function highlightGalleryPic( picture_filename_suffix ) {
	var picture_area = document.getElementById( picture_filename_suffix );
	if ( picture_area != null ) {
		picture_area.className = 'gallery_pic';
	}
	return false;
}

function fadeGalleryPic( picture_filename_suffix ) {
	var picture_area = document.getElementById( picture_filename_suffix );
	if ( picture_area != null ) {
		picture_area.className = 'gallery_pic faded_pic';
	}
	return false;
}

function redirpage() {
	var refarr = new Array( 'durnipal\.hu', 'alpinmunka\.hu', 'alpindeko\.hu', 'alakatos\.hu', 'femlakatos\.hu', 'femmunka\.hu' );
	var tmpredir = true;
	for (i in refarr) {
		var urlPattern = '^https?\:\/\/(www\.)?' + refarr[i];
        var tmpexpr = new RegExp( urlPattern );
		if (tmpexpr.test(document.referrer)) {
			tmpredir = false;
			break;
		}
	}
	if (tmpredir == true) {
		parent.window.location.href = "index.html";
	}
}