var clear_ok = 0;

function set(fr, t) {
    var from = document.getElementById('from');
    var to = document.getElementById('to');

  	for(var i = 0; i < from.length; i++) {
    		if(from[i].value == fr) {
  	     		from[i].selected = 'selected';
  		  }

    		if(to[i].value == t) {
  	     		to[i].selected = 'selected';
  		  }
    }
}

function change(where) {
    var from = document.getElementById('from');
    var to = document.getElementById('to');
    var cz;

  	for(var i = 0; i < from.length; i++) {
        if (from[i].value == 'cz') {
            cz = i;
        }
    }

    if ((!from[cz].selected) && (where == 'from')) {
        to[cz].selected = 'selected';
    }
    if ((!to[cz].selected) && (where == 'to')) {
        from[cz].selected = 'selected';    
    }
}

function revers() {
    var from = document.getElementById('from');
    var to = document.getElementById('to');

    var temp_from;
    var temp_to;
  	for(var i = 0; i < from.length; i++) {
    		if(from[i].selected) {
            from[i].selected = '';
            temp_from = i;
  		  }
    		if(to[i].selected) {
            to[i].selected = '';
            temp_to = i;
  		  }
    }
    from[temp_to].selected = 'selected';
    to[temp_from].selected = 'selected';
}

function clear_words() {
    if (!clear_ok) {
        var word = document.getElementById('search');
        word.value = '';
        word.style.color = '#000000';
        clear_ok = 1;
        
        var submit = document.getElementById("search_button");
        submit.disabled = "";
    }
}

function over_text(el) {
    el.style.color = "#ff0000";
}

function out_text(el) {
    el.style.color = "#4d5763";
}