var reDirect;

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/2-150;//150 is half popup's height

	popUpDiv.style.top = '150px';
}

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/2-150;//150 is half popup's width

	popUpDiv.style.left = window_width + 'px';
}

function popup(windowname) {
	blanket_size(windowname);
	window_pos(windowname);
	toggle('blanket');
	toggle(windowname);		
}