function switch_text(arg,val)
{
	
	var  element=document.getElementById('search_query');
 switch(arg)
{
	 
 case 0 :
 if(val=="Поиск")
 element.value = "";
 break;
 case 1 :
 if(val=="")
 element.value = "Поиск";
 break;
 }
}