function showPopup(popup) {
	
	currentOffset2 = 0;
	currentOffset = document.documentElement.scrollTop || document.documentElement.scrollTop;
	var windowHeight;
	if (!($.browser.opera)) { windowHeight = document.documentElement.clientHeight } else { windowHeight = document.body.clientHeight }
	$('#black').width(document.body.clientWidth);
	
	if ($.browser.opera) { 
		$('#black').height(document.body.scrollHeight) 
	} else if ($.browser.msie) { 
		dh = (document.body.clientHeight < document.documentElement.clientHeight) ? document.documentElement.clientHeight : document.body.clientHeight;
		$('#black').height(dh) 
	} else {
		$('#black').height(document.documentElement.scrollHeight)
	}

		

	if (windowHeight < $('#'+popup).height()) {
		currentOffset = (currentOffset + 10);
	} else {
		currentOffset2 = parseInt((document.documentElement.clientHeight - $('#'+popup).height()) / 2);
	}
	pLeft = (document.body.clientWidth - $('#'+popup).width()) / 2;
	$('.iframe').show();
	$('#black').show();
	$('#'+popup).css({top:currentOffset+currentOffset2,left:pLeft}).show();
	//alert(document.body.clientHeight +'\n'+ document.body.offsetHeight +'\n'+ document.documentElement.scrollHeight +'\n'+ document.body.scrollHeight +'\n'+ document.documentElement.clientHeight +'\n'+  document.documentElement.offsetHeight );
	
}