var hexVals = new Array("0","1","2","3","4","5","6","7","8","9","A","B","C","D","E","F"); 
var unsafeString = "<>%^[]'"; 

function highlight(element1){element1.focus();element1.select();} 

function URLDecode() 
{ 
var returnstr=unescape(form1.string1.value); 
window.alert(returnstr); 
highlight(form3.textarea2); 
// while coding i found that IE had problem writing '<form>' to innerhtml. </form> was ok. 'unknown runtime error' IE5.5. 
} 

function URLEncode(val) 
{ 
var state = 'urlenc'; 
var len = val.length; 
var backlen = len; 
var i = 0; 

var newStr = ""; 
var frag = ""; 
var encval = ""; 

for (i=0;i<len;i++) 
{ 
tval1=val.substring(i,i+1); 
newStr = newStr + "%" + decToHex(tval1.charCodeAt(0),16); 

} 
window.alert(newStr); 
//highlight(form3.textarea2); 
} 

function decToHex(num, radix) // part of URL Encode 
{ 
var hexString = ""; 
while (num >= radix) 
{ 
temp = num % radix; 
num = Math.floor(num / radix); 
hexString += hexVals[temp]; 
} 
hexString += hexVals[num]; 
return reversal(hexString); 
} 

function reversal(s) // part of URL Encode 
{ 
var len = s.length; 
var trans = ""; 
for (i=0; i<len; i++) 
{ 
trans = trans + s.substring(len-i-1, len-i); 
} 
s = trans; 
return s; 
} 

function isURLok(compareChar) // part of URL Encode 
{ 
if (unsafeString.indexOf(compareChar) == -1 && compareChar.charCodeAt(0) > 32 && compareChar.charCodeAt(0) < 123) 
{ 
return true; 
} 
else 
{ 
return false; 
} 
}