var nav_agt = navigator.userAgent.toLowerCase();
var ie = window.ActiveXObject;
var ie7 = ie && nav_agt.indexOf('msie 7')!=-1;
function $(a){return document.getElementById(a)};
function tags(a,b){return a.getElementsByTagName(b)};
function enableStyle(el){$(el).disabled=true;$(el).disabled=false;}
function disableStyle(el){$(el).disabled=false;$(el).disabled=true;}
function err(a) {alert('The function:\n'+a+'\nwas called but has failed')}
function testWS(v){if(/^\s*$/.test(v))return true; else return false;}

function getByClass(C,A) {var i,n,arr=[],p=new RegExp("(^|\\s)"+C+"(\\s|$)");for(i=0;A[i];i++) {n=A[i].className;

       if(n=='')continue;if(n==C){arr.push(A[i]);continue;}if(p.test(n))arr.push(A[i]);}return arr;};
function addEvent(el, eType, func) {
    (typeof el.addEventListener != "undefined") ?
    el.addEventListener(eType,func,false) : el.attachEvent("on"+eType,func);    
    }