function setPositionElement(value,elementId)
{
    var scrollY=0;    
    if(window.pageYOffset)
    {
        scrollY=window.pageYOffset;
    }
    if(document.all)
    {
        scrollY= document.documentElement.scrollTop;
    }
	var widCover=((Math.max(document.documentElement.scrollWidth)-parseInt(996,10))/2); 
	var htCover=((Math.max(document.documentElement.scrollHeight)-parseInt(808,10))/200); 
	var topPos = 0;
	if(htCover < 1)
	{
		topPos = 0 + "px";
	}
	else
	{
		topPos = htCover + "px";
	}
	document.getElementById(elementId).style.top = topPos; 
} 


function showPageCover()
{
    var widCover=Math.max(document.documentElement.scrollWidth, document.body.scrollWidth) + "px";
    var htCover=Math.max(document.documentElement.scrollHeight, document.body.scrollHeight) + "px";
    document.getElementById('pageCover').style.width=widCover;
    document.getElementById('pageCover').style.height=htCover;
    document.getElementById('pageCover').style.display = 'block';
    document.getElementById('pageCover').style.visibility = 'visible';
}