function chImg(theRadio){
	rootName = theRadio.name
	optName = theRadio.value
	formName = document.forms[0].name;
	if (formName == "customForm") {
		theExt = ".jpg";
		theDir = "custom/";
	} else {
		theExt = ".gif"; 
		theDir = "products/";
	}
	eval("document."+rootName+".src = 'images/"+theDir+rootName+"_"+optName+theExt+"'");
}