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function HCF(u, v) { 
	var U = u, V = v
	while (true) {
		if (!(U%=V)) return V
		if (!(V%=U)) return U 
	}
}
//convert a decimal into a fraction
function fraction(decimal){
 
	if(!decimal){
		decimal=this;
	}
	whole = String(decimal).split('.')[0];
	decimal = parseFloat("."+String(decimal).split('.')[1]);
	num = "1";
	for(z=0; z<String(decimal).length-2; z++){
		num += "0";
	}
	decimal = decimal*num;
	num = parseInt(num);
	for(z=2; z<decimal+1; z++){
		if(decimal%z==0 && num%z==0){
			decimal = decimal/z;
			num = num/z;
			z=2;
		}
	}
	//if format of fraction is xx/xxx
	if (decimal.toString().length == 2 && 
			num.toString().length == 3) {
                //reduce by removing trailing 0's
		decimal = Math.round(Math.round(decimal)/10);
		num = Math.round(Math.round(num)/10);
	}
	//if format of fraction is xx/xx
	else if (decimal.toString().length == 2 && 
			num.toString().length == 2) {
		decimal = Math.round(decimal/10);
		num = Math.round(num/10);
	}
	//get highest common factor to simplify
	var t = HCF(decimal, num);
 
	//return the fraction after simplifying it
	return ((whole==0)?"" : whole+" ")+decimal/t+"/"+num/t; }

// Test it
alert(fraction(1.75));