Search an element in a given array using JavaScript

<html>
    <head>
        <script type="text/javascript">
function show_prompt()
{
var n=document.frm.text1.value;
if( n == "")
{
alert("Please enter the array size");
}
else
{
var a=new Array();
var temp;
for(i=0;i
            <n;i++)
{
var num=prompt("Please enter element of array"," ");
documentdocument.frm.arrayTxt.value=document.frm.arrayTxt.value+num+"\n";
a[i]=parseInt(num);
}
var flag=0;
var search=prompt("Enter the element to be searched ","");
for(i=0;i
                <n;i++)
if(a[i]==search)
{
flag=1;
p=i+1;
}
if(flag==1)
alert("Element " +search + " found at position " +p);
else
alert("Sorry!, Element " + search + " not found ");
document.frm.text1.value="";
document.frm.arrayTxt.value="";
}
}
                </script>
            </head>
            <body bgcolor="lightgreen">
                <form name="frm">
                    <h3>To find an element in a given array </h3>
                    <hr color="green">
Enter the array size :
                        <input type="text" name="text1">
                            <br>
                                <br>
                                    <input type="button" onclick="show_prompt()" value="Submit">
                                        <br>
                                            <br>
                                                <textarea name="arrayTxt" rows="10" cols="4"></textarea>
                                                <br>
                                                </form>
                                            </body>
                                        </html>