text: function toggle(div_id) {
  	var el = document.getElementById(div_id);
  	if ( el.style.display == 'none' ) {	el.style.display = 'block';}
  	else {el.style.display = 'none';}
  }
  function blanket_size(popUpDivVar) {
  	if (typeof window.innerWidth != 'undefined') {
  		viewportheight = window.innerHeight;
  	} else {
  		viewportheight = document.documentElement.clientHeight;
  	}
  	if ((viewportheight > document.body.parentNode.scrollHeight) && (viewportheight > document.body.parentNode.clientHeight)) {
  		blanket_height = viewportheight;
  	} else {
  		if (document.body.parentNode.clientHeight > document.body.parentNode.scrollHeight) {
  			blanket_height = document.body.parentNode.clientHeight;
  		} else {
  			blanket_height = document.body.parentNode.scrollHeight;
  		}
  	}
  	var blanket = document.getElementById('blanket');
  	blanket.style.height = blanket_height + 'px';
  	var popUpDiv = document.getElementById(popUpDivVar);
  	popUpDiv_height=blanket_height/2-300;//100 is half popup's height
  	popUpDiv.style.top = popUpDiv_height + 'px';
  }
  function window_pos(popUpDivVar) {
  	if (typeof window.innerWidth != 'undefined') {
  		viewportwidth = window.innerHeight;
  	} else {
  		viewportwidth = document.documentElement.clientHeight;
  	}
  	if ((viewportwidth > document.body.parentNode.scrollWidth) && (viewportwidth > document.body.parentNode.clientWidth)) {
  		window_width = viewportwidth;
  	} else {
  		if (document.body.parentNode.clientWidth > document.body.parentNode.scrollWidth) {
  			window_width = document.body.parentNode.clientWidth;
  		} else {
  			window_width = document.body.parentNode.scrollWidth;
  		}
  	}
  	var popUpDiv = document.getElementById(popUpDivVar);
  	window_width=window_width/2-200;//200 is half popup's width
  	popUpDiv.style.left = window_width + 'px';
  }
  function popup(windowname) {
  	blanket_size(windowname);
  	window_pos(windowname);
  	toggle('blanket');
  	toggle(windowname);		
  }