if(document.images){  // preload start button images
	start_on = new Image; start_on.src = "../images/start_on.gif";
	start_off = new Image; start_off.src = "../images/start_off.gif";
}

function studyskillPop(url){
	popupWin=window.open(url, 'popup', 'scrollbars=yes,resizable=yes,width=455,height=450,top=25,left=25');
	myTimer=setTimeout("popupWin.focus()",100); 
}	

function alphabetPop(url){
	popupWin2=window.open(url, 'popup2', 'scrollbars=yes,resizable=yes,width=300,height=450,top=25,left=25');
	myTimer=setTimeout("popupWin2.focus()",100); 
}	

function rollover(imageName,imageFile) {
	if(!document.images) return;
	eval('document.images[imageName].src = '+imageFile+'.src');
}