function cent(amount) {

    // returns the amount in the .99 format

    amount -= 0;

    amount = Math.round(amount * 100)/100;

    return (amount == Math.floor(amount)) ? amount + '.00' : (  (amount*10 == Math.floor(amount*10)) ? amount + '0' : amount);

}





function calcPowerForField(field, skiptotal) {

    // <id> is something like "watt12"

    var cid = field.name.substr(4);

    var f = field.form;



// Piece-by-piece:	

//	    var cost =

//	        f.elements["watt"+cid].value / 1000 * // kw * 

//	        f.elements["utwk"+cid].value *        // units *

//	        f.elements["unit"+cid].options[f.elements["unit"+cid].selectedIndex].value *   // (min/week)/units *    // multiplying by "unit" field converts to min/week

//	        f.elements["usdperkwh"].value *                           // dollars/(kw * h) *

//	        365.25/7     / 60 * 100; // weeks/year *  h/min * cents/dollar



// Slightly "better"

    var cost =

	f.elements["watt"+cid].value * 

	f.elements["utwk"+cid].value *

	f.elements["unit"+cid].options[f.elements["unit"+cid].selectedIndex].value *

	f.elements["usdperkwh"].value * 36525/420000;



		// Some appliances are only on a fraction of the time that someone thinks

		// they're using it (e.g. refrigerator). So you can have a hidden field

		// whose value is a multiplier to the original value. (e.g. if it's 30% then

		// have a hidden field of name="cycleontime34" (or whatever), value="0.3"

		if (f.elements["cycleontime"+cid]) {

		    cost *= parseFloat(f.elements["cycleontime"+cid].value);

		}



    // Note cost is in cents



    var dmonth = 0, dyear = 0;

    if (!skiptotal) {

	dyear = (parseFloat(f["csyrtotal2"].value) || 0)  -

		 (parseFloat(f.elements["csyr"+cid].value) || 0);

	dmonth  = (parseFloat(f["csmototal2"].value) || 0) -

		 (parseFloat(f.elements["csmo"+cid].value) || 0);

    }



	if (f.elements["unit"+cid].options[f.elements["unit"+cid].selectedIndex].text == "months/year") {

	    f.elements["csmo"+cid].value = cent(Math.ceil(cost/f.elements["utwk"+cid].value || 0)/100);

	} else {

	    f.elements["csmo"+cid].value = cent(Math.ceil(cost/12 || 0)/100);

	}



    f.elements["csyr"+cid].value = cent(Math.ceil(cost || 0)/100);



    if (!skiptotal) {

	dmonth += parseFloat(f["csmo"+cid].value) || 0;

	dyear  += parseFloat(f["csyr"+cid].value) || 0;

	f["csyrtotal2"].value = cent(dyear);

	f["csmototal2"].value = cent(dmonth);

    }



}



function calcPowerCost(f) {

    // Calculates power costs for all fields of

    // form <f>.



    // Update cost fields

    var i=1,mototal=0,yrtotal=0;

    while(f["utwk"+i]) {

	if(f["utwk"+i].value != 0) {

	    calcPowerForField(f["utwk"+i], 1);

	    mototal += parseFloat(f["csmo"+i].value) || 0;

	    yrtotal += parseFloat(f["csyr"+i].value) || 0;

	}

	++i;

    }



    f["csmototal2"].value = cent(mototal);

    f["csyrtotal2"].value = cent(yrtotal);



}



/***********************************************

* Cool DHTML tooltip script II- © Dynamic Drive DHTML code library (www.dynamicdrive.com)

* This notice MUST stay intact for legal use

* Visit Dynamic Drive at http://www.dynamicdrive.com/ for full source code

***********************************************/



var offsetfromcursorX=12 //Customize x offset of tooltip

var offsetfromcursorY=-100 //Customize y offset of tooltip



var offsetdivfrompointerX=10 //Customize x offset of tooltip DIV relative to pointer image

var offsetdivfrompointerY=0 //Customize y offset of tooltip DIV relative to pointer image. Tip: Set it to (height_of_pointer_image-1).



document.write('<div id="dhtmltooltip"></div>') //write out tooltip DIV

document.write('<img id="dhtmlpointer" src="_img/arrow2.gif">') //write out pointer image



var ie=document.all

var ns6=document.getElementById && !document.all

var enabletip=false

if (ie||ns6)

var tipobj=document.all? document.all["dhtmltooltip"] : document.getElementById? document.getElementById("dhtmltooltip") : ""



var pointerobj=document.all? document.all["dhtmlpointer"] : document.getElementById? document.getElementById("dhtmlpointer") : ""



function ietruebody(){

return (document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body

}



function ddrivetip(thetext, thewidth, thecolor){

if (ns6||ie){

if (typeof thewidth!="undefined") tipobj.style.width=thewidth+"px"

if (typeof thecolor!="undefined" && thecolor!="") tipobj.style.backgroundColor=thecolor

tipobj.innerHTML=thetext

enabletip=true

return false

}

}



function positiontip(e){

if (enabletip){

var nondefaultpos=false

var curX=(ns6)?e.pageX : event.clientX+ietruebody().scrollLeft;

var curY=(ns6)?e.pageY : event.clientY+ietruebody().scrollTop;

//Find out how close the mouse is to the corner of the window

var winwidth=ie&&!window.opera? ietruebody().clientWidth : window.innerWidth-20

var winheight=ie&&!window.opera? ietruebody().clientHeight : window.innerHeight-20



var rightedge=ie&&!window.opera? winwidth-event.clientX-offsetfromcursorX : winwidth-e.clientX-offsetfromcursorX

var bottomedge=ie&&!window.opera? winheight-event.clientY-offsetfromcursorY : winheight-e.clientY-offsetfromcursorY



var leftedge=(offsetfromcursorX<0)? offsetfromcursorX*(-1) : -1000



//if the horizontal distance isn't enough to accomodate the width of the context menu

if (rightedge<tipobj.offsetWidth){

//move the horizontal position of the menu to the left by it's width

tipobj.style.left=curX-tipobj.offsetWidth+"px"

nondefaultpos=true

}

else if (curX<leftedge)

tipobj.style.left="5px"

else{

//position the horizontal position of the menu where the mouse is positioned

tipobj.style.left=curX+offsetfromcursorX-offsetdivfrompointerX+"px"

pointerobj.style.left=curX+offsetfromcursorX+"px"

}



//same concept with the vertical position

if (bottomedge<tipobj.offsetHeight){

tipobj.style.top=curY-tipobj.offsetHeight-offsetfromcursorY+"px"

nondefaultpos=true

}

else{

tipobj.style.top=curY+offsetfromcursorY+offsetdivfrompointerY+"px"

pointerobj.style.top=curY+offsetfromcursorY+"px"

}

tipobj.style.visibility="visible"

if (!nondefaultpos)

pointerobj.style.visibility="hidden"

else

pointerobj.style.visibility="hidden"

}

}



function hideddrivetip(){

if (ns6||ie){

enabletip=false

tipobj.style.visibility="hidden"

pointerobj.style.visibility="hidden"

tipobj.style.left="-1000px"

tipobj.style.backgroundColor=''

tipobj.style.width=''

}

}



document.onmousemove=positiontip