<input type="text" readonly="readonly" id="C_I_add" value="searchaddress" style=" width: 300px; margin-left: 30px" />
In this line your searchaddress variable is inside the string as text, you should break the string and concatenate the variable to the string like this:
<input type="text" readonly="readonly" id="C_I_add" value="' + searchaddress + '" style=" width: 300px; margin-left: 30px" />
Notice that I'm closing the string with ' and concatenate the variable with the +
And on other note, if I recall correctly Javascript is not too fond of breaking strings with line breaks