function IsNumeric(strString)
   //  check for valid numeric strings	
   {
   var strValidChars = "0123456789.-() ";
   var strChar;
   var blnResult = true;

   //if (strString.length == 0) return false;

   //  test strString consists of valid characters listed above
   if (strString.length < 8){
		  
		   return false
		}
   for (i = 0; i < strString.length && blnResult == true; i++)
      {
      strChar = strString.charAt(i);
	  
      if (strValidChars.indexOf(strChar) == -1)
         {
         blnResult = false;
		  
         }
      }
	  
   return blnResult;
   }
function IsAge(strString)
   //  check for valid numeric strings	
   {
   var strValidChars = "0123456789.-() ";
   var strChar;
   var blnResult = true;
   //if (strString.length == 0) return false;
   //  test strString consists of valid characters listed above
   if (strString.length < 1){
		   return false
		}
   for (i = 0; i < strString.length && blnResult == true; i++)
      {
      strChar = strString.charAt(i);
	  
      if (strValidChars.indexOf(strChar) == -1)
         {
         blnResult = false;
		  
         }
      }
	  
   return blnResult;
   }
function echeck(str) {

		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		if (str.indexOf(at)==-1){
		 //  alert("Invalid E-mail ")
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		  // alert("Invalid E-mail ")
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		 //   alert("Invalid E-mail ")
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		  //  alert("Invalid E-mail ")
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		  //  alert("Invalid E-mail ")
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		  //  alert("Invalid E-mail ")
		    return false
		 }
		
		// if (str.indexOf(" ")!=-1){
		 //   alert("Invalid E-mail ")
		 //   return false
		// }

 		 return true					
	}


function PopupCentrer(page,largeur,hauteur,options) {

var top=(screen.height-hauteur)/2;

var left=(screen.width-largeur)/2;

window.open(page,"","top="+top+",left="+left+",width="+largeur+",height="+hauteur+","+options);

}
function EcrireCookie(nom, valeur)
{

var argv=EcrireCookie.arguments;
var argc=EcrireCookie.arguments.length;
var expires=(argc > 2) ? argv[2] : null;
var path=(argc > 3) ? argv[3] : null;
var domain=(argc > 4) ? argv[4] : null;
var secure=(argc > 5) ? argv[5] : false;
document.cookie=nom+"="+escape(valeur)+
((expires==null) ? "" : ("; expires="+expires.toGMTString()))+
((path==null) ? "" : ("; path="+path))+
((domain==null) ? "" : ("; domain="+domain))+
((secure==true) ? "; secure" : "");

}
<!-- This script and many more are available free online at -->
<!-- The JavaScript Source!! http://javascript.internet.com -->
<!-- Begin
//Created by DendE PhisH
//  End -->