function grayscale(bol){
	var ht=document.getElementsByTagName("body");
//	ht[0].style.filter=(bol)?"progid:DXImageTransform.Microsoft.BasicImage(grayscale=1) progid:DXImageTransform.Microsoft.Blur(pixelradius=1)":"";
	ht[0].style.filter=(bol)?"progid:DXImageTransform.Microsoft.BasicImage(grayscale=1) progid:DXImageTransform.Microsoft.BasicImage(opacity=.5)":"";
}