function validateForm(form) {
if (form.companyName.value == "") {
   document.getElementById("errText").innerHTML = "<font color='red'><b>Please enter your company name</b></font>"; 
   form.companyName.focus( );
   return false;
   }
if (form.address.value == "") {
   document.getElementById("errText").innerHTML = "<font color='red'><b>Please enter your address</b></font>"; 
   form.address.focus( );
   return false;
   }  
if (form.postcode.value == "") { //This checks to make sure the field is not empty
   document.getElementById("errText").innerHTML = "<font color='red'><b>Please enter your postcode</b></font>"; 
   form.postcode.focus( ); //This focuses the cursor on the empty field
   return false; //This prevents the form from being submitted
   }
if (form.phoneno.value == "") { //This checks to make sure the field is not empty
   document.getElementById("errText").innerHTML = "<font color='red'><b>Please enter a contact number</b></font>"; 
   form.phoneno.focus( ); //This focuses the cursor on the empty field
   return false; //This prevents the form from being submitted
   }
if (form.custName.value == "") { //This checks to make sure the field is not empty
   document.getElementById("errText").innerHTML = "<font color='red'><b>Please enter your name</b></font>"; 
   form.custName.focus( ); //This focuses the cursor on the empty field
   return false; //This prevents the form from being submitted
   }
if (form.webAddress.value == "") { //This checks to make sure the field is not empty
   document.getElementById("errText").innerHTML = "<font color='red'><b>Please enter your websites address</b></font>"; 
   form.webAddress.focus( ); //This focuses the cursor on the empty field
   return false; //This prevents the form from being submitted
   }
if (form.companyType.value == "") { //This checks to make sure the field is not empty
   document.getElementById("errText").innerHTML = "<font color='red'><b>Please enter your company type (eg. IT)</b></font>"; 
   form.companyType.focus( ); //This focuses the cursor on the empty field
   return false; //This prevents the form from being submitted
   } 
if (form.email.value == "") { //This checks to make sure the field is not empty
   document.getElementById("errText").innerHTML = "<font color='red'><b>Please enter your email address</b></font>"; 
   form.email.focus( ); //This focuses the cursor on the empty field
   return false; //This prevents the form from being submitted
   }
if (echeck(form.email.value)==false){
   document.getElementById("errText").innerHTML = "<font color='red'><b>Please enter a valid email address</b></font>"; 
   form.email.focus( ); //This focuses the cursor on the empty field
   return false; //This prevents the form from being submitted
   }
}

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 ID")
		   return false
		}

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

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

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

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

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

 		 return true					
	}