function showPopup(url, name, initSettings, width, height) {
    var winSettings = initSettings;
    if(width != -1) {
        var winL = (screen.width - width) / 2;
        winSettings += ',left=' + winL + ',screenX=' + winL;
    }

    if(height != -1) {
        var winT = (screen.height - height) / 2;
        winSettings += ',top=' + winT + ',screenY=' + winT;
    }

    return window.open(url, name, winSettings);
}


function isBlank(field, label) {
    if(field.value=="") {
	alert("Don't forget to enter all required information. Enter '" + label + "' please...");
	field.focus();
    	return true;
    }else
	return false;
}


function swapIcon(imageName, newImageUrl) {
    if(document.images) {
        document.images[imageName].src = newImageUrl;
    }
}


function lengthCheck(field, minLength, label) {
    if(field.value.length < minLength) {
	alert("'" + label + "' must be at least " + minLength + " characters long ...");
	field.focus();
    	return false;
    }else
	return true;
}







function isNumber(field, label) {
    numbers="0123456789";

    for(i=0; i<field.value.length; i++) {
	if(numbers.indexOf(field.value.charAt(i)) == -1) {
	  alert("'" + label + "' must be a numeric value ...");
	  field.focus();
    	  return false;	  
	}
    }
    return true;
}


function isNumberInRange(field, minVal, maxVal, label) {

   if(!isNumber(field, label)) return false;

   if((field.value-0)<minVal || (field.value-0)>maxVal) {
     alert("'" + label + "' value must be between " + minVal + " and " + maxVal + " ...");
     field.focus();
     return false;	  
   }
}



function isAlphaNumeric(field, label) {
    alphas="0123456789abcdefghijklmnopqrstuvxwyzABCDEFGHIJKLMNOPQRSTUVXWYZ";

    for(i=0; i<field.value.length; i++) {
	if(alphas.indexOf(field.value.charAt(i)) == -1) {
	  alert("'" + label + "' must be an alphanumeric value ...");
	  field.focus();
    	  return false;	  
	}
    }
    return true;
}

function containsInvalidChars(invalidChars, field) {
    return containsInvalidCharsString(invalidChars, field.value)
}


function containsInvalidCharsString(invalidChars, svalue) {
    for(i=0; i<svalue.length; i++) {
	if(invalidChars.indexOf(svalue.charAt(i)) != -1) {
    	  return true;	  
	}
    }
    return false;
}


function isValidEmail(field, label) {
    if(!isValidEmailString(field.value)) {
        alert("Please enter a valid '" + label + "' ...");
        field.focus();
        return false;	  
    }
    return true;
}


function isValidEmailString(email){
   invalidChars="[]|?\",;~`!#$^&*()=<>/\\+{}: ";
   requiredChars="@.";

   if(email.length < 6 || containsInvalidCharsString(invalidChars, email) || 
		!containsInvalidCharsString(requiredChars, email)) {
      return false;	  
   }

   ixat=email.indexOf('@');				// @ index
   ixdot=email.lastIndexOf('.');			// . index from the end
   ixat2=email.substring(ixat+1).indexOf('@');		// a second @  --> invalid email

   if(ixat<1 || ixat2!=-1 || ixdot<ixat || (ixdot==email.length-1)) {				// must contain a . after @
      return false;	  
   }
   return true;
}


function isValidUrl(field, label) {
   invalidChars="[]\"`*()'\\: ";
   requiredChars=".";

   if(field.value.length < 6 || containsInvalidChars(invalidChars, field) || 
		!containsInvalidChars(requiredChars, field)) {
      alert("Please enter a valid '" + label + "' ...");
      field.focus();
      return false;	  
   }
   return true;
}



function getCheckedAsString(cbox) {
  var selCount=0;
  var cboxStr="";

  if(!cbox) {
    num = 0;
  }else {
    num = cbox.length;
  }

  if (cbox && !num) {
    if(cbox.checked) {
        cboxStr="-1," + cbox.value + ",-1";
    }
  }else if(num) {
    for(i=0; i<num; i++) {
        if(cbox[i].checked) {
            if(selCount==0) cboxStr="-1,";
            cboxStr = cboxStr + cbox[i].value + ",";
            selCount++;
        }
    }
    if(selCount>0) cboxStr = cboxStr + "-1";
  }

  return cboxStr;
}



function getUnCheckedAsString(cbox) {
  var selCount=0;
  var cboxStr="";

  if(!cbox) {
    num = 0;
  }else {
    num = cbox.length;
  }

  if (cbox && !num) {
    if(!cbox.checked) {
        cboxStr="-1," + cbox.value + ",-1";
    }
  }else if(num) {
    for(i=0; i<num; i++) {
        if(!cbox[i].checked) {
            if(selCount==0) cboxStr="-1,";
            cboxStr = cboxStr + cbox[i].value + ",";
            selCount++;
        }
    }
    if(selCount>0) cboxStr = cboxStr + "-1";
  }

  return cboxStr;
}



function checkboxToString(cbox) {
  var selCount=0;
  var cboxStr="";

  if(!cbox) {
    num = 0;
  }else {
    num = cbox.length;
  }

  if (cbox && !num) {
    if(cbox.checked) {
        cboxStr="-1," + cbox.value + ",-1";
    }
  }else if(num) {
    for(i=0; i<num; i++) {
        if(cbox[i].checked) {
            if(selCount==0) cboxStr="-1,";
            cboxStr = cboxStr + cbox[i].value + ",";
            selCount++;
        }
    }
    if(selCount>0) cboxStr = cboxStr + "-1";
  }

  return cboxStr;
}



function deselectAll(cbox) {

  if(!cbox) {
    num = 0;
  }else {
    num = cbox.length;
  }

  if (cbox && !num) {
    cbox.checked = false;
  }else if(num) {
    for (i=0; i < num; i++) {
      cbox[i].checked = false;
    }
  }
}



function selectAll(cbox) {

  if (!cbox)  {
    num = 0;
  }else {
    num = cbox.length;
  }

  if(cbox && !num) {
    cbox.checked = true;       // only 1 checkbox on the page.
  }else if (num) {
    for (i=0; i < num; i++) {
      cbox[i].checked = true;
    }
  }
}


function getBrowser() {
    var OS,browser;
   var detect = navigator.userAgent.toUpperCase();
 
    //if(detect.indexOf('KONQUEROR') >= 0) {
    //        browser = "KONQUEROR";
    //        OS = "Linux";
    //}else if(detect.indexOf('SAFARI') >= 0) browser = "SAFARI";
    //else if(detect.indexOf('OMNIWEB') >= 0) browser = "OMNIWEB";
    //else if(detect.indexOf('OPERA') >= 0) browser = "OPERA";
    //else if(detect.indexOf('WEBTV') >= 0) browser = "WEBTV";
    //else if(detect.indexOf('ICAB') >= 0) browser = "ICAB";

    if(detect.indexOf('SAFARI') >= 0) browser = "SAFARI";
    else if(detect.indexOf('MSIE') >= 0) browser = "MSIE";
    else if(detect.indexOf('Firefox') >= 0) browser = "FIREFOX";
    else if(detect.indexOf('COMPATIBLE') < 0) browser = "NAVIGATOR";
    else browser = "NOTSUPPORTED";

    if(!OS) {
	if(detect.indexOf('LINUX') >= 0) OS = "LINUX";
	else if(detect.indexOf('X11') >= 0) OS = "UNIX";
	else if(detect.indexOf('MAC') >= 0) OS = "MAC"
	else if(detect.indexOf('WIN') >= 0) OS = "WINDWOS"
	else OS = "NOTSUPPORTED";
    }

    return browser + " " + OS;
}


function popupMsg(msg) {
   alert(msg);
}

function trim(value){
    //trim whitespaces at the end of the string
    var ch = value.substring(value.length-1, value.length);
    while (ch == " "){
        value = value.substring(0, value.length-1);
        ch = value.substring(value.length-1, value.length);
    }

    //trim whitespaces at the beginning of the string
    ch = value.substring(0,1);
    while (ch == " "){
        value = value.substring(1, value.length);
        ch = value.substring(0,1);
    }
    
    return value;
}