var d=document;
var ScreenW=0;
var ScreenH=0;
function ge(obj){
   if(document.getElementById(obj)) {
     obj = document.getElementById(obj);
     return obj;
   } else {
     return false;
   }
}

function size_screen()
{
        var nav = navigator.appName;            
        if((nav!="Netscape")&&(nav!="Opera")) 
        {
        ScreenW = d.body.clientWidth;
        ScreenH = d.body.clientHeight;   
        }
        else
        {               
          ScreenW = window.innerWidth;
          ScreenH = window.innerHeight;
        }
        if(ScreenW<1100)
          HideBlock('navigation');
        else
         ShowBlock('navigation');
        	
}
function HideBlock(id)
{
	ge(id).style.display='none';
}
function ShowBlock(id)
{
	ge(id).style.display='block';
}

function InvertBlock(id)
{
	if(ge(id))
	{
		if(ge(id).style.display=='block')
			HideBlock(id)
		else	
			ShowBlock(id)
	}
}

function doLoad(div,action,value) {

    var req = new JsHttpRequest();	
    req.onreadystatechange = function() {
        if (req.readyState == 4) {
            switch(action){       
              default:
                ge(div).innerHTML = req.responseText;
              break;
            }
            if(req.responseJS)
            	if(req.responseJS['src'])
            		eval(req.responseJS['src']);
        }
    }   
    req.open(null, '/ajax.php', true);  
    req.send( { q: value ,div: div, action:action} );    	
 }
function check_str(){
 // var str=d.findform.str.value;
  //if(str.length>3)
   // {
  
     ge('find_form').submit();
     //return false;
    //} else {
     //alert('Слишком короткий запрос');
     //return false;
    //}
}
function set_action(action,field){
   ge('dateform').action = action;
   return true;
}

function selecttr(id,flag,class_) {
	a=" "+class_;
	if (flag) ge(id).className=ge(id).className+a;
	else {
		tmp=ge(id).className;
		ge(id).className=tmp.replace(class_,'');
	}
}