function trim( str )

{

    var trimmed = str.replace(/^\s+|\s+$/g, '');    

    return trimmed;

}



function replaceCRLF( str, rep )

{

    str = str.replace( /[\r]/g, "" ); // remove cr

    str = str.replace( /[\n]/g, rep ); // replace lf with rep character

    return str;

}



function onlyNumbers( e )

{       

    var keynum;

    var keychar;

    var numcheck;

    

    if(window.event) // IE

    {

        keynum = e.keyCode;

    }

    else if(e.which) // Netscape/Firefox/Opera

    {

        keynum = e.which;

    }

    

    keychar = String.fromCharCode(keynum);

    

    numcheck = /^[0-9]+$/;

    

    return numcheck.test(keychar);

}



function daysInMonth( month, year )

{

    // yes this works by overflowing queried date

    return 32 - new Date(year, month-1, 32).getDate();

}



function getSelectValueByID( id )

{

    var obj = document.getElementById( id ); 

    if( obj == null )

        return 'object error';

    

    return obj.options[ obj.selectedIndex ].value;

}



function getTextByID( id )

{

    var obj = document.getElementById( id );

    if( obj == null )

        return 'object error';

        

    return trim( obj.value );

}



function isEmail( str ) 

{

	var email = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;

	

	return email.test( str );

}