function trim(stringToTrim) {
	return stringToTrim.replace(/^\s+|\s+$/g,"");
}
function ltrim(stringToTrim) {
	return stringToTrim.replace(/^\s+/,"");
}
function rtrim(stringToTrim) {
	return stringToTrim.replace(/\s+$/,"");
}

var block_id = 1; 
var mouse_hover = true; 

function check_hover(){
  jQuery('.block').hover(function(){ mouse_hover = false; },function(){ mouse_hover = true; });   
}
// change riders wtb-life  
//nepouziva se - predelano na random bez cyklovani
function change_block(block_count){                 
  check_hover();      
  if( mouse_hover == true ){                  
    jQuery('.rand_'+block_id).fadeOut(1000,function () {
      jQuery('.rand_'+block_id).css("display","none");
      if(block_id == block_count ){
        block_id = 1;
      }else{
        block_id = block_id + 1;
      }                  
      jQuery('.rand_'+block_id).fadeIn(1000);
    });        
  }          
}