Get Random Numbers

HTML

<input type="button" value="Get Random Value" onClick="getranvalue()"/>

JavaScript

function getranvalue(){
            var randomnumber = Math.floor(Math.random()*4999)
            var keyid = parseInt(randomnumber);            
            if(keyid == 0){
                keyid = 1;
            }
            alert(keyid);
        }

Example

Click Here to DEMO