// commonFunctions.js

// disabledButton
function disableButton() {
	var buttonElements = document.getElementsByTagName("input");
	
	for(var i = 0; i < buttonElements.length; i++) 
	{
		if(buttonElements[i].type=='image')
			buttonElements[i].disabled=true;
	}

}

// enableButton
function enableButton() {
	var buttonElements = document.getElementsByTagName("input");
	
	for(var i = 0; i < buttonElements.length; i++) 
	{
		if(buttonElements[i].type=='image')
			buttonElements[i].disabled=false;
	}
}

function replace(string,text,by) 
{
// Replaces text with by in string
    var strLength = string.length, txtLength = text.length;
    if ((strLength == 0) || (txtLength == 0)) return string;

    var i = string.indexOf(text);
    if ((!i) && (text != string.substring(0,txtLength))) return string;
    if (i == -1) return string;

    var newstr = string.substring(0,i) + by;

    if (i+txtLength < strLength)
        newstr += replace(string.substring(i+txtLength,strLength),text,by);

    return newstr;
}