var numb = "0123456789+- "
function valform(){
	var errorchk = new Array("FirstName");
	var errorchk1 = new Array("Name");	
	
	var errormsg = "You have missed the following details:\n\n"
	for (i=0; i < errorchk.length; i++){
		nvv = "ch_" + errorchk[i];
		document.getElementById(nvv).style.color = "#5F5C63";
		if	(document.contact1[errorchk[i]].value == ""){
			document.getElementById(nvv).style.color = "red";
			errormsg += [errorchk1[i] + "\n"]
		}
	}
	if (document.contact1.Telephone.value != ""){
	document.getElementById('ch_Telephone').style.color = "#5F5C63";
	var nums = document.contact1.Telephone.value
		for (var k=0; k < nums.length; k++){
			if (numb.indexOf(nums.charAt(k)) == -1){
				document.getElementById('ch_Telephone').style.color = "red";
				errormsg += "\nTelephone must only contain numbers"
				break;
			}
		}
	}
	if (document.contact1.Size.value != ""){
	document.getElementById('ch_Desks').style.color = "#5F5C63";
	var nums = document.contact1.Size.value
		for (var k=0; k < nums.length; k++){
			if (numb.indexOf(nums.charAt(k)) == -1){
				document.getElementById('ch_Desks').style.color = "red";
				errormsg += "\nNumber of desks must only contain numbers"
				break;
			}
		}
	}
	
	if (errormsg != "You have missed the following details:\n\n"){
		alert(errormsg)
		return false;
	}
}