function explode( delimiter, string ) {
    var emptyArray = { 0: '' };
    if ( arguments.length != 2 || typeof arguments[0] == 'undefined' || typeof arguments[1] == 'undefined' ){   return null;  }
    if ( delimiter === '' || delimiter === false || delimiter === null ){ return false; }
    if ( typeof delimiter == 'function' || typeof delimiter == 'object' || typeof string == 'function' || typeof string == 'object' ){return emptyArray; }    
    if ( delimiter === true ) { delimiter = '1';  }
    return string.toString().split ( delimiter.toString() );
}
function str_replace(search, replace, subject) {
    return subject.split(search).join(replace);
} 

function snov_elem(){
   var pos=explode(' ',document.getElementById('wrapper').style.backgroundPosition);
   tops=str_replace('pt','',pos[1]);
   tops=str_replace('px','',tops);
     if (tops=="131"){
       var tops=0;
     } else {
       tops++;
     }
  document.getElementById('wrapper').style.backgroundPosition="0pt "+tops+"px";
    setTimeout('snov_elem()', 0050); 
}
//snov_elem();