function checnum(as)
{
	var dd = as.value;
	
	if(isNaN(dd))
	{
		dd = dd.substring(0,(dd.length-1));
		as.value = dd;
	}		
}


function calsi()
{
	var ty = document.sint.ss.value;
	var si = document.sint.res4.value;
	var p = document.sint.res1.value;
	var r = document.sint.res2.value;
	var t = document.sint.res3.value;
	var ti = document.sint.time.value;

	if(ty == 4)
	{
		t=t/ti;
		si = p*r*t/100
		document.sint.res4.value=Math.round(si*1000)/1000;
	}
	if(ty == 1)
	{
		t=t/ti;
		p = (si*100)/(r*t)
		document.sint.res1.value=Math.round(p*1000)/1000;
	}
	if(ty == 2)
	{
		t=t/ti;
		r = (si*100)/(p*t)
		document.sint.res2.value=Math.round(r*1000)/1000;
	}
	if(ty == 3)
	{
		document.sint.time[0].selected=true;
		t = (si*100)/(r*p)
		document.sint.res3.value=Math.round(t*1000)/1000;
	}

	return false;
}

function modf()
{
	for(var h=1; h<5; h++)
	{
		var dd = "document.sint.res"+h;
		ss = eval(dd);
		ss.disabled=false;
		ss.style.backgroundColor="#eefaff";
		ss.style.color= "#000000";
	}
	var vv = document.sint.ss.value;
	var dd = "document.sint.res"+vv;
	ss = eval(dd);
	ss.disabled=true;
	ss.value="";
	ss.style.color= "black";
	ss.style.backgroundColor="#bbc7dd";
}

function color(test)
{
	var myI=document.getElementsByTagName("input").item(4);
	myI.style.backgroundColor=test;
}


function color1(test)
{
var myI=document.getElementsByTagName("table").item(0);
//myI.setAttribute("style",ch);
myI.style.backgroundColor=test;
}