function addClass(what, className){
    var classes=what.className.split(" ");
    if (arrayContains(classes, className)==false)
        what.className+=" "+className;
}
function removeClass(what, className){
    var classes=what.className.split(" ");
    var newClasses=new Array();
    for(var i=0;i<classes.length;i++)
        if (classes[i]!=className)
            newClasses[newClasses.length]=classes[i];
    what.className=newClasses.join(" ");
}
function arrayContains(arr, value){
    for(i=0;i<arr.length;i++)
        if (arr[i]==value)
            return true;
    return false;
}
function arrayIndexOf(arr, value){
    for(i=0;i<arr.length;i++)
        if (arr[i]==value)
            return i;
    return -1;
}
function hasClass(what, className){
    var classes=what.className.split(" ");
    return arrayContains(classes, className);
}
function findByClass(elem_type, className){
    var result=[];
    var elems=document.getElementsByTagName(elem_type);
    for(var i=0;i<elems.length;i++)
        if (hasClass(elems[i], className))
            result.push(elems[i]);
    return result;
}
function checkSearchField(id){
    var proceed=true;
    var field=document.getElementById(id);
    if (field.value.length==0){
        proceed=false;
        alert("Please provide some text to search for");
        field.focus();
    }
    return proceed;
}
function hide(id){
    if(typeof id=="string")
        document.getElementById(id).style.display="none";
    else
        id.style.display="none";
}
function showBlock(id){
    if(typeof id=="string")
        document.getElementById(id).style.display="block";
    else
        id.style.display="block";
}
function showInline(id){
    if(typeof id=="string")
        document.getElementById(id).style.display="inline";
    else
        id.style.display="inline";
}
/**
 * Concatenates the values of a variable into an easily readable string
 * by Matt Hackett [scriptnode.com]
 * @param {Object} x The variable to debug
 * @param {Number} max The maximum number of recursions allowed (keep low, around 5 for HTML elements to prevent errors) [default: 10]
 * @param {String} sep The separator to use between [default: a single space ' ']
 * @param {Number} l The current level deep (amount of recursion). Do not use this parameter: it's for the function's own use
 */
function print_r(x, max, sep, l) {

    l = l || 0;
    max = max || 10;
    sep = sep || ' ';

    if (l > max) {
	return "[WARNING: Too much recursion]\n";
    }

    var
    i,
    r = '',
    t = typeof x,
    tab = '';

    if (x === null) {
	r += "(null)\n";
    } else if (t == 'object') {

	l++;

	for (i = 0; i < l; i++) {
	    tab += sep;
	}

	if (x && x.length) {
	    t = 'array';
	}

	r += '(' + t + ") :\n";

	for (i in x) {
	    try {
		r += tab + '[' + i + '] : ' + print_r(x[i], max, sep, (l + 1));
	    } catch(e) {
		return "[ERROR: " + e + "]\n";
	    }
	}

    } else {

	if (t == 'string') {
	    if (x == '') {
		x = '(empty)';
	    }
	}

	r += '(' + t + ') ' + x + "\n";

    }

    return r;

};
function numbersonly(e) {
  var controlKeys=[8,9,35,36,37,39,46,13];
  var unicode=e.charCode? e.charCode : e.keyCode;
  return (arrayContains(controlKeys, unicode) || (unicode>=48 && unicode<=57));
} 
function clearForm(form_id){
    var form=document.getElementById(form_id);
    for (var i=0;i<form.elements.length;i++){
        var element=form.elements[i];
        if (!element.disabled && element.name){
            var value=null;
            switch(element.type.toLowerCase()){
            case 'checkbox':
                element.checked=false;
                break;
            case 'radio':
                break;
            case 'select-one':
                element.selectedIndex=0;
                break;
            case 'select-multiple':
                var values, length = element.length;
                if (length>0){
                    for (var j = 0, values = []; j < length; j++) {
                        var opt = element.options[j];
                        opt.selected=false;
                    }
                }
                break;
            case 'button':
            case 'submit':
                break;
            default:
                element.value="";
                break;
            }
        }
    }
}
function trim(s){
  return s.replace(/^\s+|\s+$/, '');
}
// general purpose "plain-ol-javascript object"
function pojo(){
}
function str_repeat(i, m) { for (var o = []; m > 0; o[--m] = i); return(o.join('')); }
function sprintf() {
  var i = 0, a, f = arguments[i++], o = [], m, p, c, x;
  while (f) {
    if (m = /^[^\x25]+/.exec(f)) o.push(m[0]);
    else if (m = /^\x25{2}/.exec(f)) o.push('%');
    else if (m = /^\x25(?:(\d+)\$)?(\+)?(0|'[^$])?(-)?(\d+)?(?:\.(\d+))?([b-fosuxX])/.exec(f)) {
      if (((a = arguments[m[1] || i++]) == null) || (a == undefined)) throw("Too few arguments.");
      if (/[^s]/.test(m[7]) && (typeof(a) != 'number'))
        throw("Expecting number but found " + typeof(a));
      switch (m[7]) {
        case 'b': a = a.toString(2); break;
        case 'c': a = String.fromCharCode(a); break;
        case 'd': a = parseInt(a); break;
        case 'e': a = m[6] ? a.toExponential(m[6]) : a.toExponential(); break;
        case 'f': a = m[6] ? parseFloat(a).toFixed(m[6]) : parseFloat(a); break;
        case 'o': a = a.toString(8); break;
        case 's': a = ((a = String(a)) && m[6] ? a.substring(0, m[6]) : a); break;
        case 'u': a = Math.abs(a); break;
        case 'x': a = a.toString(16); break;
        case 'X': a = a.toString(16).toUpperCase(); break;
      }
      a = (/[def]/.test(m[7]) && m[2] && a > 0 ? '+' + a : a);
      c = m[3] ? m[3] == '0' ? '0' : m[3].charAt(1) : ' ';
      x = m[5] - String(a).length;
      p = m[5] ? str_repeat(c, x) : '';
      o.push(m[4] ? a + p : p + a);
    }
    else throw ("Huh ?!");
    f = f.substring(m[0].length);
  }
  return o.join('');
}