function checkFloTex(e, sender) {
	var f = e.form;
	var theThickness = f.thickness.selectedIndex;
	var thicknessMeasurement = f.thickness.value;
	var theGrade = f.grade.selectedIndex;
	// Thickness only matters if FloTex is selected.
	if ((theGrade == 2) && (theThickness == 0)) {
		alert ("FloTex sheets are not available in " + thicknessMeasurement + "\" thickness.\n(This selection will default to 0.25\".)\nPlease choose another thickness.");
		f.thickness.selectedIndex = 1;
		f.thickness.focus();
	}
}