Please find the below javascript script for open the div base layer on the screen.
/*function showBox()
{
var width = document.documentElement.clientWidth + document.documentElement.scrollLeft;
var layer = document.createElement('div');
layer.style.zIndex = 2;
layer.id = 'layer';
layer.style.position = 'absolute';
layer.style.top = '0px';
layer.style.left = '0px';
if(document.documentElement.scrollHeight < 800 )
{
layer.style.height = 835 + 'px';
}
else
{
layer.style.height = document.documentElement.scrollHeight + 'px';
}
layer.style.width = width + 'px';
layer.style.backgroundColor = 'black';
layer.style.opacity = '.6';
layer.style.filter += ("progid:DXImageTransform.Microsoft.Alpha(opacity=60)");
document.body.appendChild(layer);
var div = document.createElement('div');
div.style.zIndex = 3;
div.id = 'box';
div.style.position = (navigator.userAgent.indexOf('MSIE 6') > -1) ? 'absolute' : 'fixed';
div.style.top = '200px';
div.style.left = (width / 2) - (400 / 2) + 'px';
div.style.height = '150px';
div.style.width = '500px';
div.style.backgroundColor = 'white';
div.style.border = '2px solid silver';
div.style.padding = '20px';
document.body.appendChild(div);
var a = document.createElement('div');
a.innerHTML = '
