function trim(str, chars) {
    return ltrim(rtrim(str, chars), chars);
}

function ltrim(str, chars) {
    chars = chars || "\\s";
    return str.replace(new RegExp("^[" + chars + "]+", "g"), "");
}

function rtrim(str, chars) {
    chars = chars || "\\s";
    return str.replace(new RegExp("[" + chars + "]+$", "g"), "");
}

function checkEmail(frmName,elementName){
	var fieldValue = document.forms[frmName].elements[elementName].value;
	var chkAt = fieldValue.indexOf("@");
	var chkDot= fieldValue.indexOf(".");
	var chkHack= fieldValue.indexOf("@.");
	var chkHackA= fieldValue.indexOf(".@");
	if((chkAt >= 0) && (chkDot >= 0) && (chkHack == -1) && (chkHackA == -1) ) {
		return true;
	}
	return false;
}

function validateContactForm(fieldName){
	var errorArr = new Array();
	
	if(!fieldName){
	
		if(trim(document.contact.from.value)==""){
			errorArr['from'] = "Please enter your email address";
		}else if(!checkEmail('contact','from')){
			errorArr['from'] = "Please enter a valid email address";
		}
		if(trim(document.contact.thoughts.value)==""){
			errorArr['thoughts'] = "Please let us know your thoughts";
		}
		if(trim(document.contact.code.value)==""){
			errorArr['code'] = "Please enter the Anti-spam code";
		}
		
		if((errorArr['from'])&&(errorArr['from']!="")){
			document.getElementById('fromErrTxt').innerHTML = errorArr['from'];
			document.contact.from.className = "redBorder";
		}else{
			document.getElementById('fromErrTxt').innerHTML = " ";
			document.contact.from.className = "whiteBorder";
		}
		
		if((errorArr['thoughts'])&&(errorArr['thoughts']!="")){
			document.getElementById('thoughtsErrTxt').innerHTML = errorArr['thoughts'];
			document.contact.thoughts.className = "redBorder";
		}else{
			document.getElementById('thoughtsErrTxt').innerHTML = " ";
			document.contact.thoughts.className = "whiteBorder";
		}
		
		if((errorArr['code'])&&(errorArr['code']!="")){
			document.getElementById('codeErrTxt').innerHTML = errorArr['code'];
			document.contact.code.className = "redBorder";
		}else{
			document.getElementById('codeErrTxt').innerHTML = " ";
			document.contact.code.className = "whiteBorder";
		}
	}else{
		switch(fieldName){
			case "from":			
				if(trim(document.contact.from.value)==""){
					errorArr['from'] = "Please enter your email address";
				}else if(!checkEmail('contact','from')){
					errorArr['from'] = "Please enter a valid email address";
				}
							
				if((errorArr['from'])&&(errorArr['from']!="")){
					document.getElementById('fromErrTxt').innerHTML = errorArr['from'];
					document.contact.from.className = "redBorder";
				}else{
					document.getElementById('fromErrTxt').innerHTML = " ";
					document.contact.from.className = "whiteBorder";
				}			
			break;
			case "thoughts":
				if(trim(document.contact.thoughts.value)==""){
					errorArr['thoughts'] = "Please let us know your thoughts";
				}		
			
				if((errorArr['thoughts'])&&(errorArr['thoughts']!="")){
					document.getElementById('thoughtsErrTxt').innerHTML = errorArr['thoughts'];
					document.contact.thoughts.className = "redBorder";
				}else{
					document.getElementById('thoughtsErrTxt').innerHTML = " ";
					document.contact.thoughts.className = "whiteBorder";
				}			
			break;
			case "code":
				if(trim(document.contact.code.value)==""){
					errorArr['code'] = "Please enter the Anti-spam code";
				}		
			
				if((errorArr['code'])&&(errorArr['code']!="")){
					document.getElementById('codeErrTxt').innerHTML = errorArr['code'];
					document.contact.code.className = "redBorder";
				}else{
					document.getElementById('codeErrTxt').innerHTML = " ";
					document.contact.code.className = "whiteBorder";
				}			
			break;
		}
	}
	
	if((errorArr['from'])||(errorArr['thoughts'])||(errorArr['code'])){
		return false;
	}else{
		return true;
	}
	return false;
}