//js/checkMark  put checkMark() in onload
var check = "pix/check.gif"
mark = new Image()
mark.src = check 
function checkMark(n) {
var num = (n == null) ? document.title.charAt(3) : n.toString()
var Ch = 'Ch' + num
var results = (getCookie(Ch)!=null) ? getCookie(Ch) : ''
results += ','
for (var i=0;i<document.images.length;i++) {
	var imageName=document.images[i].name
	if (imageName.charAt(0)=='Q') imageName = imageName.substring(0,2)+'.'+imageName.substring(2)
	else if (imageName.charAt(0)=='x') imageName = imageName.substring(1,2)+'.'+imageName.substring(2,5)+' '+imageName.substring(5)
	else if (imageName.charAt(0)=='I') imageName = 'revEx ' + imageName
	else if (imageName.charAt(0)=='c') imageName = num + '.x-word' // crosswords
	else if (imageName.charAt(0)=='t') imageName = 'T' + num + '.' + imageName.substring(1)
	else imageName = ''
	if ( imageName != '' && results.indexOf(imageName + ',')>-1 ) document.images[i].src = check
	}
}