function openWindow(filename) {
	str = 'MathCal/' + filename + '.jpg'
	popupWin = window.open(str,'EIN','scrollbars,resizable,toolbar,width=500,height=550,left=50,top=50');
	popupWin.focus();
}

function openWindowHTM(filename) {
	str = 'MathCal/' + filename + '.htm'
	popupWin = window.open(str,'EIN','scrollbars,resizable,toolbar,width=500,height=550,left=50,top=50');
	popupWin.focus();
}

function openWindowPC(filename) {
	str = filename + '.jpg'
	popupWin = window.open(str,'EIN','scrollbars,resizable,toolbar,width=500,height=550,left=50,top=50');
	popupWin.focus();
}

function openWindowHTMPC(filename) {
	str = filename + '.htm'
	popupWin = window.open(str,'EIN','scrollbars,resizable,toolbar,width=500,height=550,left=50,top=50');
	popupWin.focus();
}