var dFormName = "usage_calculator";
initPage = function() {
	if ( document.getElementById ) {
		// grab the form - the name/id must be usage_calculator
		dForm = document.getElementById( dFormName );
		// now add the form submit event
		dForm.onsubmit = postBack;
		// first run through the inputs
		dElements = dForm.getElementsByTagName("input");
		/*
		for ( i = 0 ; i < dElements.length ; i++ ) {
			dElementName = String(dElements[i].name);
			if ( dElementName.indexOf("value_") != -1 ) {
				dElements[i].onchange = calculateMiles;
			}
			if ( dElementName.indexOf("hidden_") != -1 ) {
				dElements[i].onchange = calculateTotal;
			}
		}*/
		// now run through the selects
		/*
		dElements = dForm.getElementsByTagName("select");
		for ( i = 0 ; i < dElements.length ; i++ ) {
			dElementName = String(dElements[i].name); 
			if ( dElementName.indexOf("units_") != -1 ) {
				dElements[i].onchange = calculateMiles;
			}
		}*/
	}
}


addEvent( window, "load", initPage );