// function warn() & function calc()
// calculate tyre size
function warn() {
	if (event.button==2) {
		alert('Use Left Button !')
	}
}

document.onmousedown = warn

function calc() {

   var w = document.size.width.value;
   var x = w*document.size.profile.value/.127;
   var y = document.size.wheel.value * 100;
   document.size.ov_diamA.value = Math.round(x + y)/100;
   document.size.ov_diamB.value = Math.round((x + y)*25.4/100);

   var w1 = document.size.width1.value;
   var x1 = w1*document.size.profile1.value/.127;
   var y1 = document.size.wheel1.value * 100;
   document.size.ov_diamA1.value = Math.round(x1 + y1)/100;
   document.size.ov_diamB1.value = Math.round((x1 + y1)*25.4/100);

   document.size.difference.value=document.size.ov_diamB1.value-document.size.ov_diamB.value;
   document.size.diffpercent.value=(Math.round(10000*(document.size.ov_diamB1.value-document.size.ov_diamB.value)/document.size.ov_diamB.value))/100;

} //EoFn

<!--
// estimates ET from HP
var wheelHP=true
function calculate() {
 if(wheelHP){
  document.input.et.value=Math.pow((document.input.weight.value
   /document.input.hp.value), (1/3))*5.825
 }else{
   document.input.et.value=Math.pow((document.input.weight.value
    /(document.input.hp.value*.854)), (1/3))*5.825
 }
}
//-->

// function calc_power_conversions()
// converts from different units of power to another

function calc_power_conversions()
{with (document.power)
	{
		finaltext.value=original.value*from.value;
		finaltext.value =finaltext.value*to.value;
	}
}

// function click=calc_ktomph()
// converts from kilometres to miles and vice versa

function calc_ktomph()
{with (document.theformkmtomph)
	{
		var fred = from.value;
		asmd = fred.split("|");
		finaltext.value=((original.value-0)+(asmd[0]-0)-0);
		finaltext.value=finaltext.value-(asmd[1]-0);
		finaltext.value=finaltext.value*(asmd[2]-0);
		finaltext.value=finaltext.value/(asmd[3]-0);
		if ((asmd[4]-0) != 0) {
			finaltext.value=(asmd[4]-0)/finaltext.value;
		}
		var fred = to.value;
		asmd = fred.split("|");
		if ((asmd[4]-0) != 0) {
			finaltext.value=(asmd[4]-0)/finaltext.value;
		}
		finaltext.value=finaltext.value/(asmd[3]-0);
		finaltext.value=finaltext.value*(asmd[2]-0);
		finaltext.value=finaltext.value-(asmd[1]-0);
		finaltext.value=(finaltext.value-0)+(asmd[0]-0);
	}
}

// function calc_kg_to_lb()
// converts kg to lb and lb to kg
function calc_kg_to_lb()
{with (document.theformkgtolb)
	{
		var fred = from.value;
		asmd = fred.split("|");
		finaltext.value=((original.value-0)+(asmd[0]-0)-0);
		finaltext.value=finaltext.value-(asmd[1]-0);
		finaltext.value=finaltext.value*(asmd[2]-0);
		finaltext.value=finaltext.value/(asmd[3]-0);
		if ((asmd[4]-0) != 0) {
			finaltext.value=(asmd[4]-0)/finaltext.value;
		}
		var fred = to.value;
		asmd = fred.split("|");
		if ((asmd[4]-0) != 0) {
			finaltext.value=(asmd[4]-0)/finaltext.value;
		}
		finaltext.value=finaltext.value/(asmd[3]-0);
		finaltext.value=finaltext.value*(asmd[2]-0);
		finaltext.value=finaltext.value-(asmd[1]-0);
		finaltext.value=(finaltext.value-0)+(asmd[0]-0);
	}
}