function open_window(url,w,h)
{
var left = parseInt( (document.body.clientWidth/2) - w/2 );
var window_name ="window"+Math.floor(Math.random()*100)+1;
window.open(url, window_name,"width="+w+",height="+h+",top=50%,left="+left+",resizable=no,location=no,scrollbars=1,status=no,toolbar=no,directories=no,menubar=yes");
}


function img(image) 
{
window.open("/show_img.php?image="+image,"show_img","width=200,height=200,top=0,left=0,resizable=no,location=no,scrollbars=no,status=no,toolbar=no,directories=no");
}

function clear_search()
{

	if(document.search_form.q.value == '')
	{
	document.search_form.q.value = 'поиск';
	}
}


function ch_a_chl(id)
{	
	if( document.getElementById(id).style.display == 'none')
	{
	document.getElementById(id).style.display = 'block';
	}
	else
	{
	document.getElementById(id).style.display = 'none';
	}
}