function Validate(){

mApplicant = document.registrationform.Applicant.value;
mEmail = document.registrationform.Email.value;

mreturn = true;
mText = "";
mFocus = false;

if ((mApplicant == '') || (trim(mApplicant) == '')){
mText = 'An Applicant name is required. \n';
document.registrationform.Applicant.focus();
mFocus = true;
mreturn = false;
}
		

if ((mEmail == '') || (trim(mEmail) == '')){
mText = (mText +'\n An Email is required.\n');
if(!mFocus){
document.registrationform.Email.focus();
mFocus = true;
}
mreturn = false;
}		


if (!document.registrationform.Disclaimer.checked){
mText = (mText + '\n You must agree to the terms before submitting.');
if(!mFocus){
document.registrationform.Disclaimer.focus();
}
mreturn = false;
}	
if (!mreturn){
window.alert(mText);
}

return mreturn;
}




<!-- This script and many more are available free online at -->
<!-- The JavaScript Source!! http://javascript.internet.com -->

function trim(str_inString)
    {
    	var char_ptr = 0;
    	var rstring = str_inString;
    	var tmpstring = str_inString;
    	if(str_inString != "")
        	{	
        		while(rstring.charAt(char_ptr) == ' ')
            		{
            			char_ptr ++;
            		}
            		tmpstring = rstring.substring(char_ptr, rstring.length);
            		rstring = tmpstring;
            		char_ptr = rstring.length - 1;
            		while(rstring.charAt(char_ptr) == ' ')
                		{
                			char_ptr --;
                		}
                		tmpstring = rstring.substring(0, char_ptr + 1)
                		rstring = tmpstring;
                		return rstring;
                	}
            }