function isEmail (emailStr) {

		

    		var b = 0 ;

    		var i = 0 ;

    		var errmsg = "Please enter a valid email address" ;

    		var punct = "" ;

    		var min = 0 ;

    		var max = 0 ;

            

            var checkTLD=1;

            var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum|ws)$/;

            var emailPat=/^(.+)@(.+)$/;

            var specialChars="\\(\\)><@,;:\\\\\\\"\\.\\[\\]";

            var validChars="\[^\\s" + specialChars + "\]";

            var quotedUser="(\"[^\"]*\")";

            var atom=validChars + '+';

            var word="(" + atom + "|" + quotedUser + ")";

            var userPat=new RegExp("^" + word + "(\\." + word + ")*$");

            var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");

            var matchArray=emailStr.match(emailPat);

            

            if (matchArray==null) {

              alert(errmsg);

              return false;

            }

            var user=matchArray[1];

            var domain=matchArray[2];

            

            for (i=0; i<user.length; i++) {

              if (user.charCodeAt(i)>127) {

              alert(errmsg);

              return false;

              }

            }

            for (i=0; i<domain.length; i++) {

              if (domain.charCodeAt(i)>127) {

              alert(errmsg);

              return false;

              }

            }

            

            if (user.match(userPat)==null) {

              alert(errmsg);

              return false;

            }

            

            var atomPat=new RegExp("^" + atom + "$");

            var domArr=domain.split(".");

            var len=domArr.length;

            for (i=0;i<len;i++) {

    			if (domArr[i].search(atomPat)==-1) {

                  alert(errmsg);

                  return false;

                }

            }

            

            if (checkTLD && domArr[domArr.length-1].length!=2 &&

              domArr[domArr.length-1].search(knownDomsPat)==-1) {

              alert(errmsg);

              return false;

            }

            

            if (len<2) {

              alert(errmsg);

              return false;

            }

            

           	return true;

        }		

		

		function checkform(f) {

			var myform = document.getElementById(f);

			

			//Perform field validation

			if (myform.f_firstname.value == "") {

				 alert("Please enter a value for the \"First Name\" field.");

				 myform.f_firstname.focus();

				 return (false)

	  		}

		  	

			if (myform.f_lastname.value == "") {

			   alert("Please enter a value for the \"Last Name\" field.");

			   myform.f_lastname.focus();

			   return (false);

			}

		

		    var Email  = myform.f_email.value;

		

		    if (!isEmail(Email)) {

		       //alert("Please enter a valid email address.");

		       myform.f_email.focus();

		       return (false);

			} 		 

	

	 		if (myform.f_phone.value == "") {

			   alert("Please enter a value for the \"Telephone\" field.");

			   myform.f_phone.focus();

			   return (false);

			}	

	  		

			if (myform.f_phone.value.length < 10) {

				alert("Please enter at least 10 characters in the \"Telephone\" field.");

				myform.f_phone.focus();

				return (false);

			}				

			

            //Get the values Contact Time, time Zone, Day and Mission from the bottom form.

            //var day = document.getElementById("day");

            //var contacttime = document.getElementById("contacttime");

            //var timezone = document.getElementById("timezone");

            //var Mission = document.getElementById("Mission");

             

            //if (day.value == "1") {

            //	alert("Please select Day.");

            //	day.focus();

            //	return (false);

            //}		

			          

		    //if (contacttime.value == "1") {

            //	alert("Please select the Best Time to Contact.");

            //	contacttime.focus();

            //	return (false);

            //} 

            

            //if (timezone.value == "1") {

            //	alert("Please select your Time Zone.");

            //	timezone.focus();

            //	return (false);

            //} 

  

			// only allow numbers to be entered

	  		var checkOK = "0123456789-() .+";

	  		var checkStr = myform.f_phone.value;

	  		var allValid = true;

	  		var allNum = "";

	  

	  		for (i = 0;  i < checkStr.length;  i++) {

				ch = checkStr.charAt(i);

	

			    for (j = 0;  j < checkOK.length;  j++)

	  			if (ch == checkOK.charAt(j))

	  			break;

		  

	  		    if (j == checkOK.length) {

		    	allValid = false;

		    	break;

		  

		  		}

		  

		  		if (ch != ",")

		    	allNum += ch;

	  		}

		  

	  	  	 if (!allValid) {

		 	 	alert("Please only use numerical characters in the Telephone field. ");

		 		myform.f_phone.focus();

		 		return (false);

	  		 }

			 

			 return (true);

		}		

		

        function OpenNewNormalWindow(fileName,w,h) {

          		   var winl = (screen.width - w) / 2;

             	   var wint = (screen.height - h) / 2;

             	   winprops = 'height='+ h +',width='+ w +',top='+wint+',left='+winl+',resizable=1,directories=no,location=no,menubar=no,scrollbars=1,titlebar=0,status=0,toolbar=no'

           		   window.open(fileName,"", winprops)

        } 

		

		//Count the number of characters left in textboxes 

		function textCounter(field, countfield, maxlimit) {

			if ( field.value.length > maxlimit ) {

    		   field.value = field.value.substring( 0, maxlimit );

			   alert('Textarea value can only be 170 characters in length.');

    		   return false;

  		 	} else {

    	 	  countfield.value = maxlimit - field.value.length;

  			}

		}