function isNumeric(str){
	var len= str.length;
	if (len==0)
		return false;
	var p=0;
	var ok= true;
	var ch= "";
	while (ok && p<len){
		ch= str.charAt(p);
		if (('0'<=ch && ch<='9'))
			p++;
		else
			ok= false;
	}
	return ok;
}
function checkValues(){
	if (document.F1.username.value.length > 0 && document.F1.password.value.length > 0){
		if (!isNumeric(document.F1.username.value)){
			alert("Login Failed. Please try again.");
			return false;
		}else{
			document.F1.submit();
		}
	}else{
		alert("Login Failed. Please try again.");
		return false;
	}
}

browserName = navigator.appName.substring(0,8);
browserVer = parseFloat(navigator.appVersion);
var Browser = 0;
if (browserName == 'Microsof' && browserVer < 4){Browser = 0;}
if (browserName == 'Microsof' && browserVer >= 4){Browser = 1;}
if (browserName == 'Netscape' && browserVer < 4){Browser = 1;}
if (browserName == 'Netscape' && browserVer >= 4){Browser = 1;}
if(Browser == 1){
            v_img = new Array(12);
            for (m=0; m<=12; m++){
            v_img[m] = new Image();
            }
            v_img[0].src = '../images/but_howitworks.gif';
            v_img[1].src = '../images/but_howitworks_over.gif';
            v_img[2].src = '../images/but_home.gif';
            v_img[3].src = '../images/but_home_over.gif';				
            v_img[4].src = '../images/but_search.gif';
            v_img[5].src = '../images/but_search_over.gif';	
            v_img[6].src = '../images/but_register.gif';
            v_img[7].src = '../images/but_register_over.gif';	
            v_img[8].src = '../images/but_login.gif';
            v_img[9].src = '../images/but_login_over.gif';
            v_img[10].src = '../images/but_regulations.gif';
            v_img[11].src = '../images/but_regulations_over.gif';	
}
function m_over(x){
            if(Browser == 1){
            if(x == 1){
			setTimeout('document.i1.src = v_img[1].src',0);
			}
            if(x == 2){
			setTimeout('document.i2.src = v_img[3].src',0);
			}	
            if(x == 3){
			setTimeout('document.i3.src = v_img[5].src',0);
			}
            if(x == 4){
			setTimeout('document.i4.src = v_img[7].src',0);
			}	
            if(x == 5){
			setTimeout('document.i5.src = v_img[9].src',0);
			}	
            if(x == 6){
			setTimeout('document.i6.src = v_img[11].src',0);
			}	
		}
}
function m_out(x){
            if(Browser == 1){
            if(x == 1){
            setTimeout('document.i1.src = v_img[0].src',0);
            }
            if(x == 2){
            setTimeout('document.i2.src = v_img[2].src',0);
            }			
            if(x == 3){
            setTimeout('document.i3.src = v_img[4].src',0);
            }	
            if(x == 4){
            setTimeout('document.i4.src = v_img[6].src',0);
            }	
            if(x == 5){
            setTimeout('document.i5.src = v_img[8].src',0);
            }	
            if(x == 6){
            setTimeout('document.i6.src = v_img[10].src',0);
            }
       }
}