function checknumber(a){
    var d = "1234567890";
    var b;
    var e;
    for (b = 0; b < a.length; b++) {
        e = a.charAt(b);
        if (d.indexOf(e) == -1) {
            return true
        }
    }
    return false
}

function round(b, a){
    return (Math.round(b * Math.pow(10, a)) * Math.pow(10, -a))
}
 
  
function CheckMyForm(){
    var a = document.getElementById("txt_num").value;
    if (checknumber(a)) {
        alert("Only enter number");
        document.getElementById("txt_num").value = "";
        document.getElementById("ho_price").value = "";
        document.getElementById("txt_num").focus()
    }
    else {
        my_txt = document.getElementById("txt_num").value;
        sum = round(my_txt * 18 / 2000, 2);
        
     		
				sum=Math.round(sum*100)/100;




        document.getElementById("price").innerHTML = "$" + sum;
        document.getElementById("ho_price").value = sum
    }
}

function check(){
    var a = document.getElementById("txt_num");
    if ((a.value < 5000)) {
        alert("At least more than 5000");
        a.focus();
        return false
    }
    return true
};