Common JavaScript functions (i)

/*********************************************************************************
* Function:isbetween
* Parameters:val as any value
* Lo as Lower limit to check
* Hi as higher limit to check
* calls:nothing
* Returns:true If Val is between Lo and hi both inclusive, otherwise false.
**********************************************************************************/
Function Isbetween (Val, lo, hi) {
if (Val < lo) | | (val > Hi)) {return (false);}
else {return (true);}
}
/*********************************************************************************
* Function:isdate checks a valid date
* Parameters:thestr as String
* Calls:isbetween, Isint
* Returns:true If THESTR is a valid date otherwise false.
**********************************************************************************/
function IsDate (THESTR) {
var the1st = thestr.indexof ('-');
var the2nd = thestr.lastindexof ('-');

if (the1st = = the2nd) {return (false);}