function str_replace (search, replace, subject){
	var result = "";
	var  oldi = 0;
	for (i = subject.indexOf (search); i > -1; i = subject.indexOf (search, i)){
		result += subject.substring (oldi, i);
		result += replace;
		i += search.length;
		oldi = i;
	}
		return result + subject.substring (oldi, subject.length);
}

function in_array(needle, haystack, strict) {
    // http://kevin.vanzonneveld.net
    // +   original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // *     example 1: in_array('van', ['Kevin', 'van', 'Zonneveld']);
    // *     returns 1: true
 
    var found = false, key, strict = !!strict;
 
    for (key in haystack) {
        if ((strict && haystack[key] === needle) || (!strict && haystack[key] == needle)) {
            found = true;
            break;
        }
    }
 
    return found;
}
function is_numeric( mixed_var ) {
    return !isNaN( mixed_var );
}


function getElementsByClass(node,searchClass,tag) {
  var classElements = new Array();
  var els = node.getElementsByTagName(tag);
  var elsLen = els.length;
  var pattern = new RegExp("\b"+searchClass+"\b");
  for (i = 0, j = 0; i < elsLen; i++) {
    if ( pattern.test(els[i].className) ) {
      classElements[j] = els[i];
      j++;
    }
  }
return classElements;
}