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('');
}


function open_window(target, width, height, params){
	var win_top = (screen.availHeight - height) / 2;
	var win_left = (screen.availWidth - width) / 2;
	if (!params) params = {};
	
	var data = "width=" + width + ", height=" + height + ", left=" + win_left + ", top=" + win_top;
	data += ", menubar=" + (params.menubar ? params.menubar : "yes");
	data += ", toolbar=" + (params.toolbar ? params.toolbar : "yes");
	data += ", location=" + (params.location ? params.location : "no");
	data += ", resizable=" + (params.resizable ? params.resizable : "1");
	data += ", scrollbars=" + (params.scrollbars ? params.scrollbars : "1");
	data += ", status=" + (params.status ? params.status : "1");
	data += ", titlebar=" + (params.titlebar ? params.titlebar : "1");

	newwin=window.open("", target, data);
	return newwin;
}



function show_hidden(div_name) {
	div = document.getElementById(div_name);
	if (div)
	{
		if (div.style.display == 'none') show_div(div_name);
		else hide_div(div_name);
	}
}

function hide_div(element_id){
	document.getElementById(element_id).style.display = "none";
}

function show_div(element_id){
	document.getElementById(element_id).style.display = "block";
}

function e(id) { return document.getElementById(id); }