function Gid(id){
 return document.getElementById(id);
} //function Gid

 function ChekPlaceholder(name, param){ 
	var aim = Gid(name)	
	if(aim.value==param){
	   $(aim).addClass('placeholder')
	}
	else{
	   $(aim).removeClass('placeholder')
	}	
  }  
  $(document).ready(function() {	
  	ChekPlaceholder('search', 'поиск по сайту')	
  //	ChekPlaceholder('s_keys_placeholder', 'Поиск')	
  })