function updateVal(theField, minVal, maxVal, imageObj)
{
// alert (theField.value)
     fixPixOffset = 50
       curVal = theField.value;
	   theDiff = maxVal - minVal;
	   valOffset = curVal - minVal;
	   pixOffset = (valOffset*100.0/theDiff)
		   pixOffset = Math.round(pixOffset);
//		   alert(pixOffset)
       
	   // also calculate the maximum and minimum ranges
	   theOffset = pixOffset+fixPixOffset
	if (theOffset < 0)
	{
		    theOffset = 0
	}
	if (theOffset > 200)
	{
		    theOffset = 200
	}

		   imageObj.width=theOffset
} // updateVal