JavaScript simulation to implement ajax loading box example_javascript skills

function loading(p_value,str)
{
if (p_value)
{
if (!document.getElementById("load_area"))
{
var para1 = document.createElement("span");
var node=document.createTextNode(str);
para1.appendChild(node);
var para=document.createElement("div");
para.id="load_area";
var top=document.body.scrollTop document.documentElement.scrollTop;//Get the actual height in the page
top_position = top 157 "px";
para.style.top =top_position;
icon.style.cssText = ";vertical-align:middle;padding-right:4px;margin-top:-2px;"
para.style.cssText =
";position:absolute;left:50%;width:140px;margin-left:-70px;height:50px;line-height:50px;font-size:18px;text-overflow:ellipsis;overflow:hidden; white- space:nowrap;text-align:center;background-color: #000;border-radius:2px;-webkit-box-shadow:0 2px 2px rgba(0,0,0,0.5);color:#eee;" ;

var icon = new Image();
icon.src="images/loading1.gif";//Replace
with the actual path here document.body.appendChild(para);

para.appendChild(icon);

para.appendChild(para1);

}
else
{
document.getElementById("load_area").style.display="block";
}
}
else
{
document.getElementById("load_area").style.display="none";
}
}

loading(true,"Loading..." ); loading(false)