function getAllByTagClass(searchClass) {
		var el = new Array();
		var tags = document.getElementsByTagName('table');
		var tcl = " "+searchClass+" ";
		var j = 0;
		for (i=0,j=0; i<tags.length; i++) {
			var test = " "+tags[i].className+" ";
			if (test.indexOf(tcl) != -1) {
				el[j++] = tags[i];
			}
		}
		return el;
	}

	function filter(param) {
		if (param == '') {
			$('.dictionary-table').show();
		} else {
			$('.dictionary-table').hide();
			$('#letter_'+param).show();
		}
	}