function onMask(){
	var mask = document.createElement('div'); 
	mask.setAttribute('id', 'mask'); 
	document.body.appendChild(mask);
	mask.innerHTML = '<div style="width:100%;height:100%;opacity:.7;filter:alpha(opacity=70);background-color:transparent !important;background-color:#333333;background-image/**/:url(\'http://survey-images.uslandandranches.com/SurveySoftware/images/mask.png\')!important;background-image:none;background-repeat:repeat;" onclick="offMask()"></div>'; 
	mask.style.position = 'absolute'; 
	mask.style.top = '0px'; 
	mask.style.left = '0px'; 
	mask.style.zIndex = '998'; 
	var w = ((document.documentElement.scrollWidth > document.body.scrollWidth) ? document.documentElement.scrollWidth : document.body.scrollWidth);
	var h = ((document.documentElement.scrollHeight > document.body.scrollHeight) ? document.documentElement.scrollHeight : document.body.scrollHeight);
	mask.style.width = w + 'px'; 
	mask.style.height = h + 'px'; 
	mask.style.display = 'block'; 
	var question = document.getElementById('question');
	question.style.visibility = 'visible';
	question.style.left = (w/2) - 200 + 'px';
	question.style.bottom = (screen.height/2) - 106 + 'px';
}
function offMask(){document.getElementById('mask').style.visibility='hidden';document.getElementById('question').style.visibility='hidden';document.getElementById('mask').style.display='none';document.getElementById('question').style.display='none'}