function URLGetString( ){
      	urlArr=location.href.split('?');
	      if(urlArr.length<2)
	        return;
	      paramArray=urlArr[1].split('&');
	      for(var i=0;i<paramArray.length;i++){
		      var t=paramArray[i].split('=');
       		if(1<t.length){
			     this[t[0]]=t[1];
			   }
	      }
}

function _URLGetString_exists(strProperty){
	      return(typeof this[strProperty]!='undefined');
}

URLGetString.prototype.exists=_URLGetString_exists;