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=(viewportheight/2)-(popUpDiv.offsetHeight/2);
//popUpDiv.style.top = popUpDiv_height+$(document).scrollTop() + 'px';
}
function window_pos(popUpDivVar) {
if (typeof window.innerWidth != 'undefined') {
viewportwidth = window.innerHeight;
} else {
viewportwidth = document.documentElement.clientWidth;

}
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);
popUpDiv_width=(window_width/2)-(popUpDiv.offsetWidth/2);
popUpDiv.style.left = popUpDiv_width + 'px'; 

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