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<script type="text/javascript">
function find_ratio()
{var x=document.getElementById("x1").value;var y=document.getElementById("y1").value;var gcd=calc(x,y);var r1=x/gcd;var r2=y/gcd;var ratio=r1+":"+r2;document.getElementById("res").value=ratio;
}
function calc(n1,n2)
{var num1,num2;if(n1 < n2){ num1=n1;num2=n2;
}else{num1=n2;num2=n1;}var remain=num2%num1;while(remain>0){num2=num1;num1=remain;remain=num2%num1;}return num1;
}function isInteger(s,iid)
{var i;s = s.toString();for (i = 0; i < s.length; i++){var c;if(s.charAt(i)=="."){}else{
c = s.charAt(i);}if (isNaN(c)) {
alert("Given value is not a number");document.getElementById(iid).value="";
return false;}}return true;
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<table cellspacing=0 cellpadding=2 style="border:1px solid green;" align=center>
<tr><td>Enter the x value:</td><td><nput type="text" id="x1" onkeyup="isInteger(this.value,this.id);"></td></tr>
<tr><td>Enter the y value:</td><td><input type="text" id="y1" onkeyup="isInteger(this.value,this.id);"></td></tr>
<tr><td colspan=2 align=center><input type="button" value="Find Ratio" onclick="find_ratio()"></td></tr>
<tr><td colspan=2 align=center>Ratio:<input type="text" readonly id="res" style="font-weight:bold;" size="6"></td></tr></table>
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