function getDocumentHeight()
{
	return (document.body.scrollHeight > document.body.offsetHeight)?document.body.scrollHeight:document.body.offsetHeight;
}

function hide_window(id)
{
 	document.getElementById(id).style.display = "none";
  	lock_screen(false);
}
  
function view_window(id)
{
  	document.getElementById(id).style.marginTop  =  (document.body.scrollTop-250)  + 'px';
  	document.getElementById(id).style.display = "block";
  	lock_screen(true);
}

function lock_screen(value)
{
    if(value)
    {
     document.getElementById('lock').style.height = getDocumentHeight()+'px';
     document.getElementById('lock').style.display = "block";     
    }
    else
    {
     document.getElementById('lock').style.display = "none";
    }
 }

function view(pic_url)
{
   document.getElementById('view_pic').innerHTML = '<img src=\"'+pic_url+'\" id=\"cur\" onclick=\"hide_window(\'view_pic\')\"><br><div id=\"close_link\"><a href =\"javascript:hide_window(\'view_pic\')\">Закрыть</a></div>';
   view_window('view_pic');
}